[
  {
    "sku": "NU224",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU224",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 288,
    "static_load_kN": 320,
    "fatigue_load_limit_kN": 33.5,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 3700,
    "weight_g": 5460,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 120 mm shaft NTN supplies NU224: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 3,200 r/min on grease and 3,700 r/min on oil. Numbering ties NU224 to its envelope: type code NU, series NU200, 120 mm bore; the 215×40 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NU224 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 3,200 r/min is .86 of the 3,700 r/min oil value for NU224; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 120 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,700 r/min need positive flow and drain design; the 5460 g NU224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 215 mm race brinells and releases as vibration within hours.",
      "The 47.5 mm section at 120 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.",
      "Do not replace NU224 with a deep-groove ball bearing on rating alone: line contact gives 288 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NU224 with a deep-groove ball bearing on rating alone: line contact gives 288 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 288/320 kN ratings, 33.5 kN Pu and 5460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU224?",
        "a": "NU224 is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 288 kN, C0 320 kN, Pu 33.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 5460 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU224 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU224 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU224 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU224?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU224-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu224",
      "NU224"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU224E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU224E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 370,
    "static_load_kN": 420,
    "fatigue_load_limit_kN": 44,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU224E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 120×215×40 mm ISO 15 envelope. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 215 mm OD and 40 mm width from the ISO 15 general plan. With C 370 kN and C0 420 kN (C0/C ≈ 1.14) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Equivalent-load planning treats NU224E as a pure radial bearing: keep P below 370 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the NU224E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 370/420 kN pair here belongs to NU224E as printed, not to the bare size.",
      "Open NU224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.",
      "Grease limiting speed 2,900 r/min and oil 3,400 r/min are different limits for NU224E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU224E skids at 2,900 r/min and fails by smearing long before L10 fatigue.",
      "The 370/420 kN ratings, 44 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU224E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU224E?",
        "a": "NU224E is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 420 kN, Pu 44 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU224E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU224E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU224E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU224E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU224E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu224e",
      "NU224E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2224",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2224",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 385,
    "static_load_kN": 460,
    "fatigue_load_limit_kN": 48,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3400,
    "weight_g": 8030,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2224 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 120×215×58 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 143.5 mm and Ew 191.5 mm — the envelope inside the 120/215 mm bore/OD where the rollers actually run. Rating life at 385 kN C assumes clean oil and adequate film; the 48 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 8030 g NUP2224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 215×58 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2224 skids at 2,900 r/min and fails by smearing long before L10 fatigue.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 215×58 mm envelope matches.",
      "The 385/460 kN ratings, 48 kN Pu and 8030 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2224?",
        "a": "NUP2224 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 385 kN, C0 460 kN, Pu 48 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 8030 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2224 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2224 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2224 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2224?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2224-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2224",
      "NUP2224"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2224E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2224E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 500,
    "static_load_kN": 620,
    "fatigue_load_limit_kN": 64.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2224E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 500 kN dynamic rating in the 120 mm bore. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). The 58 mm width and 47.5 mm section put the NUP2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass Dimensions 120×215×58 mm and the 500 kN C rating define the substitution envelope; check the 2203E mass column for this exact NUP2224E execution. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2224E.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the NUP2224E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 47.5 mm section at 120 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.",
      "Open NUP2224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2224E skids at 2,600 r/min and fails by smearing long before L10 fatigue.",
      "Open NUP2224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.",
      "The 500/620 kN ratings, 64.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2224E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2224E?",
        "a": "NUP2224E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 620 kN, Pu 64.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2224E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2224E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2224E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2224E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2224E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2224e",
      "NUP2224E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP224",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP224",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 288,
    "static_load_kN": 320,
    "fatigue_load_limit_kN": 33.5,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 3700,
    "weight_g": 5460,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP224 appears as a 120 mm bore single-row cylindrical roller bearing (288 kN C / 320 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP224 floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP224 designation when purchasing. Rating life at 288 kN C assumes clean oil and adequate film; the 33.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 120 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,700 r/min need positive flow and drain design; the 5460 g NUP224 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 47.5 mm section at 120 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.",
      "Do not replace NUP224 with a deep-groove ball bearing on rating alone: line contact gives 288 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.",
      "The 288/320 kN ratings, 33.5 kN Pu and 5460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP224 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP224?",
        "a": "NUP224 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 288 kN, C0 320 kN, Pu 33.5 kN, grease limiting speed 3,200 r/min, oil 3,700 r/min, mass about 5460 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP224 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP224 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP224 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP224?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm, Ew 191.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP224-ECJ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup224",
      "NUP224"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP224E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP224E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 370,
    "static_load_kN": 420,
    "fatigue_load_limit_kN": 44,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP224E on the 120×215 mm envelope, 40 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,900 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 215 mm OD and 40 mm width from the ISO 15 general plan. The 40 mm width and 47.5 mm section put the NUP200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 3.1 kN-per-mm-bore figure (370 kN over 120 mm) lets a NUP224E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the NUP224E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 370/420 kN pair here belongs to NUP224E as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 370/420 kN pair here belongs to NUP224E as printed, not to the bare size.",
      "Do not replace NUP224E with a deep-groove ball bearing on rating alone: line contact gives 370 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NUP224E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.",
      "The 370/420 kN ratings, 44 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP224E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP224E?",
        "a": "NUP224E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 40 mm width (4.724 × 8.465 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 420 kN, Pu 44 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP224E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP224E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP224E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP224E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 143.5 mm. The nominal bore/OD remain 120/215 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP224E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup224e",
      "NUP224E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2324",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2324",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 785,
    "static_load_kN": 920,
    "fatigue_load_limit_kN": 92.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_g": 21100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2324 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 785 kN dynamic rating in the 120 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N2324 designation when purchasing. Thermal planning around the 2,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,800 r/min for continuously high-duty 120 mm positions. Housing and shaft fillets must clear the ring chamfers of N2324; an oversized radius locks the ring on its face and tilts the 86 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 21100 g N2324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for N2324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2324 skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.",
      "The 785/920 kN ratings, 92.5 kN Pu and 21100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2324?",
        "a": "N2324 is an NTN N single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 920 kN, Pu 92.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 21100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2324 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2324 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2324 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2324?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2324",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2324",
      "N2324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N324",
    "brand": "NTN",
    "manufacturer_designation": "NTN N324",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 500,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 51,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3200,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N324 denotes a 120×260×55 mm (4.724 × 10.236 × 2.165 in) cylindrical roller bearing in the N300 family, a pressed sheet-steel cage. Numbering ties N324 to its envelope: type code N, series N300, 120 mm bore; the 260×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 500 kN and C0 510 kN (C0/C ≈ 1.02) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. The 120 mm (4.724 in) bore and 260 mm (10.236 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 55 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 120 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g N324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 2,700 r/min and oil 3,200 r/min are different limits for N324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N324 skids at 2,700 r/min and fails by smearing long before L10 fatigue.",
      "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N324?",
        "a": "N324 is an NTN N single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N324 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N324 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N324 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N324?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N324-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n324",
      "N324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF324",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF324",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 500,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 51,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3200,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF324 appears as a 120 mm bore single-row cylindrical roller bearing (500 kN C / 510 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF324 floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 2,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,200 r/min for continuously high-duty 120 mm positions. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g NF324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NF324 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NF324 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 2,700 r/min and oil 3,200 r/min are different limits for NF324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NF324 as printed, not to the bare size.",
      "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF324?",
        "a": "NF324 is an NTN NF single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF324 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF324 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF324 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF324?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF324",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf324",
      "NF324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2324",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2324",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 785,
    "static_load_kN": 920,
    "fatigue_load_limit_kN": 92.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_g": 21100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 120 mm shaft NTN supplies NJ2324: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,400 r/min on grease and 2,800 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2324 floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. With C 785 kN and C0 920 kN (C0/C ≈ 1.17) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Heat the inner ring to max 120 °C for the 120 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 21100 g NJ2324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 260×86 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 785/920 kN pair here belongs to NJ2324 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2324 skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "The 785/920 kN ratings, 92.5 kN Pu and 21100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2324?",
        "a": "NJ2324 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 920 kN, Pu 92.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 21100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2324 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2324 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2324 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2324?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2324-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2324",
      "NJ2324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2324E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2324E",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 880,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2324E is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 120×260×86 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NJ2324E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 120 mm (4.724 in) bore and 260 mm (10.236 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 86 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NJ2324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ2324E with a deep-groove ball bearing on rating alone: line contact gives 880 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NJ2324E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NJ2324E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.",
      "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 880/1030 kN ratings, 103 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2324E?",
        "a": "NJ2324E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 880 kN, C0 1030 kN, Pu 103 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2324E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2324E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2324E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2324E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2324E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2324e",
      "NJ2324E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ324",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ324",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 500,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 51,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3200,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ324 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 120×260×55 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 51 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.02 (510/500 kN) shows the high-static-capacity proportioning of this 120 mm bore. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 120 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g NJ324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NJ324 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NJ324 as printed, not to the bare size.",
      "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ324?",
        "a": "NJ324 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ324 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ324 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ324 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ324?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ324-ECJ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj324",
      "NJ324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ324E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ324E",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 610,
    "fatigue_load_limit_kN": 61,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ324E on the 120×260 mm envelope, 55 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,400 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 120 mm (00–03 use the 10/12/15/17 exception table). The 70.0 mm radial section ((260−120)/2) frames the roller complement; capacity per millimetre of bore is about 4.9 kN/mm before application factors. Thermal planning around the 2,400 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,800 r/min for continuously high-duty 120 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NJ324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ324E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/610 kN pair here belongs to NJ324E as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/610 kN pair here belongs to NJ324E as printed, not to the bare size.",
      "The 70.0 mm section at 120 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "The 585/610 kN ratings, 61 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ324E?",
        "a": "NJ324E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 610 kN, Pu 61 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ324E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ324E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ324E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ324E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ324E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj324e",
      "NJ324E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2324",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2324",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 785,
    "static_load_kN": 920,
    "fatigue_load_limit_kN": 92.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_g": 21100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2324 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 120×260×86 mm ISO 15 envelope. Numbering ties NU2324 to its envelope: type code NU, series NU2300, 120 mm bore; the 260×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2324. Equivalent-load planning treats NU2324 as a pure radial bearing: keep P below 785 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 21100 g NU2324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 785/920 kN pair here belongs to NU2324 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The 785/920 kN ratings, 92.5 kN Pu and 21100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2324?",
        "a": "NU2324 is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 920 kN, Pu 92.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 21100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2324 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2324 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2324 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2324?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2324-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2324",
      "NU2324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2324E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2324E",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 880,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2324E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 880 kN dynamic rating in the 120 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 120 mm, with 260 mm OD and 86 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 154 mm — the envelope inside the 120/260 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 103 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.17 (1030/880 kN) shows the high-static-capacity proportioning of this 120 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NU2324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU2324E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NU2324E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 120 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 260×86 mm envelope matches.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 120 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 260×86 mm envelope matches.",
      "The 880/1030 kN ratings, 103 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2324E?",
        "a": "NU2324E is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 880 kN, C0 1030 kN, Pu 103 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2324E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2324E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2324E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2324E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2324E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2324e",
      "NU2324E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU324",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU324",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 500,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 51,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3200,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU324 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 500 kN dynamic rating in the 120 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU324 floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 154 mm and Ew 226 mm — the envelope inside the 120/260 mm bore/OD where the rollers actually run. Thermal planning around the 2,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,200 r/min for continuously high-duty 120 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 120 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g NU324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NU324 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 500/510 kN pair here belongs to NU324 as printed, not to the bare size.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 120 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 260×55 mm envelope matches.",
      "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU324?",
        "a": "NU324 is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU324 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU324 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU324 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU324?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU324-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu324",
      "NU324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU324E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU324E",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 610,
    "fatigue_load_limit_kN": 61,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU324E denotes a 120×260×55 mm (4.724 × 10.236 × 2.165 in) cylindrical roller bearing in the NU300 family, the high-capacity pressed-steel cage of the E execution. Numbering ties NU324E to its envelope: type code NU, series NU300, 120 mm bore; the 260×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,800 r/min with oil versus 2,400 r/min with grease (a 400 r/min band), lubrication choice for NU324E is a thermal decision, not just a sealing one. Thermal planning around the 2,400 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,800 r/min for continuously high-duty 120 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NU324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU324E skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/610 kN pair here belongs to NU324E as printed, not to the bare size.",
      "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NU324E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 585/610 kN ratings, 61 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU324E?",
        "a": "NU324E is an NTN NU single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 610 kN, Pu 61 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU324E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU324E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU324E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU324E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU324E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu324e",
      "NU324E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2324",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2324",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 785,
    "static_load_kN": 920,
    "fatigue_load_limit_kN": 92.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_g": 21100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2324 on the 120×260 mm envelope, 86 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,400 r/min. Numbering ties NUP2324 to its envelope: type code NUP, series NUP2300, 120 mm bore; the 260×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,800 r/min with oil versus 2,400 r/min with grease (a 400 r/min band), lubrication choice for NUP2324 is a thermal decision, not just a sealing one. Mass 21100 g for the 120×260×86 mm NUP2324 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2324 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 21100 g NUP2324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.",
      "Open NUP2324 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 120 mm contact.",
      "The 70.0 mm section at 120 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NUP2324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 785/920 kN ratings, 92.5 kN Pu and 21100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2324?",
        "a": "NUP2324 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 785 kN, C0 920 kN, Pu 92.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 21100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2324 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2324 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2324 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2324?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2324-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2324",
      "NUP2324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2324E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2324E",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 880,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 120 mm shaft NTN supplies NUP2324E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,200 r/min on grease and 2,500 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2324E floats or locates; the numeric remainder is the ISO 15 series and 120 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NUP2324E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 120 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NUP2324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 120 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 260×86 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2324E skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 880/1030 kN ratings, 103 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2324E?",
        "a": "NUP2324E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 880 kN, C0 1030 kN, Pu 103 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2324E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2324E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2324E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2324E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2324E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2324e",
      "NUP2324E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP324",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP324",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 500,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 51,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3200,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP324 is the standard section of the NTN NUP300 dimension series for a 120 mm shaft — 500 kN of basic dynamic capacity in a 12500 g, open bearing. Digit by digit, NUP324 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 120 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 3,200 r/min with oil versus 2,700 r/min with grease (a 500 r/min band), lubrication choice for NUP324 is a thermal decision, not just a sealing one. The 4.2 kN-per-mm-bore figure (500 kN over 120 mm) lets a NUP324 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 120 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 3,200 r/min need positive flow and drain design; the 12500 g NUP324 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP324 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 2,700 r/min and oil 3,200 r/min are different limits for NUP324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP324 skids at 2,700 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 2,700 r/min and oil 3,200 r/min are different limits for NUP324: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 500/510 kN ratings, 51 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP324 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP324?",
        "a": "NUP324 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 500 kN, C0 510 kN, Pu 51 kN, grease limiting speed 2,700 r/min, oil 3,200 r/min, mass about 12500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP324 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP324 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP324 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP324?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm, Ew 226 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP324-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup324",
      "NUP324"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP324E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP324E",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 610,
    "fatigue_load_limit_kN": 61,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP324E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 120×260×55 mm ISO 15 envelope. Numbering ties NUP324E to its envelope: type code NUP, series NUP300, 120 mm bore; the 260×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NUP324E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 2,400 r/min is .86 of the 2,800 r/min oil value for NUP324E; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NUP324E; an oversized radius locks the ring on its face and tilts the 55 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 120 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NUP324E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 120 mm inner ring.",
      "The 70.0 mm section at 120 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 120 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 585/610 kN ratings, 61 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP324E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP324E?",
        "a": "NUP324E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 55 mm width (4.724 × 10.236 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 610 kN, Pu 61 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP324E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP324E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP324E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP324E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 154 mm. The nominal bore/OD remain 120/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP324E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup324e",
      "NUP324E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4926",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4926",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 180,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 244,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 47,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 3900,
    "weight_g": 3520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN4926 on the 130×180 mm envelope, 50 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 3,300 r/min. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 180 mm OD and 50 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN4926. Mass 3520 g for the 130×180×50 mm NN4926 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NN4926; an oversized radius locks the ring on its face and tilts the 50 mm-wide seat.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,900 r/min need positive flow and drain design; the 3520 g NN4926 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 130 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 180×50 mm envelope matches.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4926 does not substitute a precision-class execution.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.",
      "The 244/440 kN ratings, 47 kN Pu and 3520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4926 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4926?",
        "a": "NN4926 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 180 mm OD and 50 mm width (5.118 × 7.087 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 440 kN, Pu 47 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 3520 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4926 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4926 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4926?",
        "a": "NN4926 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4926?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 146 mm. The nominal bore/OD remain 130/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4926",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4926",
      "NN4926"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4926K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4926K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 180,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 244,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 47,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 3900,
    "weight_g": 3350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN4926K denotes a 130×180×50 mm (5.118 × 7.087 × 1.969 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN4926K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN4926K. The 130 mm (5.118 in) bore and 180 mm (7.087 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 50 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN4926K.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,900 r/min need positive flow and drain design; the 3350 g NN4926K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN4926K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "Open NN4926K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "The 50 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 180 mm race brinells and releases as vibration within hours.",
      "The 244/440 kN ratings, 47 kN Pu and 3350 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4926K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4926K?",
        "a": "NN4926K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 180 mm OD and 50 mm width (5.118 × 7.087 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 440 kN, Pu 47 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 3350 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4926K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4926K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4926K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4926K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4926 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4926K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 146 mm. The nominal bore/OD remain 130/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4926K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4926k",
      "NN4926K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4926K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4926K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 180,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 244,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 47,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 3900,
    "weight_g": 3520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4926K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 244 kN dynamic rating in the 130 mm bore. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 180 mm OD and 50 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NNU4926K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 244 kN C assumes clean oil and adequate film; the 47 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,900 r/min need positive flow and drain design; the 3520 g NNU4926K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 50 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "The K tapered bore of NNU4926K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Open NNU4926K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 244/440 kN ratings, 47 kN Pu and 3520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4926K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4926K?",
        "a": "NNU4926K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 180 mm OD and 50 mm width (5.118 × 7.087 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 440 kN, Pu 47 kN, grease limiting speed 3,300 r/min, oil 3,900 r/min, mass about 3520 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4926K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4926K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4926K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4926K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4926 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4926K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 146 mm. The nominal bore/OD remain 130/180 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,300 r/min grease / 3,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4926K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4926k",
      "NNU4926K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1026",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1026",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 191,
    "static_load_kN": 238,
    "fatigue_load_limit_kN": 24.9,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 3630,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 130 mm shaft NTN supplies N1026: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 3,400 r/min on grease and 4,000 r/min on oil. Numbering ties N1026 to its envelope: type code N, series N1000, 130 mm bore; the 200×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N1026. The 1.5 kN-per-mm-bore figure (191 kN over 130 mm) lets a N1026 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 4,000 r/min need positive flow and drain design; the 3630 g N1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for N1026: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1026 skids at 3,400 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.",
      "The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1026?",
        "a": "N1026 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 33 mm width (5.118 × 7.874 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 238 kN, Pu 24.9 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 3630 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1026 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1026 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1026 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1026?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 148 mm, Ew 182 mm. The nominal bore/OD remain 130/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1026",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1026",
      "N1026"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1026",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1026",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 191,
    "static_load_kN": 238,
    "fatigue_load_limit_kN": 24.9,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 3630,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ1026 on the 130×200 mm envelope, 33 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,400 r/min. Digit by digit, NJ1026 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 4,000 r/min with oil versus 3,400 r/min with grease (a 600 r/min band), lubrication choice for NJ1026 is a thermal decision, not just a sealing one. The 130 mm (5.118 in) bore and 200 mm (7.874 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 33 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 4,000 r/min need positive flow and drain design; the 3630 g NJ1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1026 skids at 3,400 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 191/238 kN pair here belongs to NJ1026 as printed, not to the bare size.",
      "Grease limiting speed 3,400 r/min and oil 4,000 r/min are different limits for NJ1026: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1026?",
        "a": "NJ1026 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 33 mm width (5.118 × 7.874 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 238 kN, Pu 24.9 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 3630 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1026 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1026 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1026 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1026?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 148 mm, Ew 182 mm. The nominal bore/OD remain 130/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1026-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1026",
      "NJ1026"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3026",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3026",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 315,
    "static_load_kN": 475,
    "fatigue_load_limit_kN": 50,
    "limiting_speed_rpm": 3100,
    "max_rpm": 3100,
    "speed_oil_rpm": 3600,
    "weight_g": 5920,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3026 denotes a 130×200×52 mm (5.118 × 7.874 × 2.047 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3026 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3026. Selection arithmetic: Pu 50 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.51 (475/315 kN) shows the high-static-capacity proportioning of this 130 mm bore. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 5920 g NN3026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN3026 with a deep-groove ball bearing on rating alone: line contact gives 315 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3026 does not substitute a precision-class execution.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.",
      "The 315/475 kN ratings, 50 kN Pu and 5920 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3026?",
        "a": "NN3026 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 475 kN, Pu 50 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min, mass about 5920 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3026 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3026 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3026?",
        "a": "NN3026 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3026?",
        "a": "NTN rates NN3026 at 3,100 r/min with grease and 3,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3026",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3026",
      "NN3026"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3026K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3026K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 315,
    "static_load_kN": 475,
    "fatigue_load_limit_kN": 50,
    "limiting_speed_rpm": 3100,
    "max_rpm": 3100,
    "speed_oil_rpm": 3600,
    "weight_g": 5710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3026K appears as a 130 mm bore single-row cylindrical roller bearing (315 kN C / 475 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 3,100 r/min grease and 3,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 130 mm bore. The 130 mm (5.118 in) bore and 200 mm (7.874 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 52 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 5710 g NN3026K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "The K tapered bore of NN3026K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3026K skids at 3,100 r/min and fails by smearing long before L10 fatigue.",
      "The K tapered bore of NN3026K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The 315/475 kN ratings, 50 kN Pu and 5710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3026K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3026K?",
        "a": "NN3026K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 315 kN, C0 475 kN, Pu 50 kN, grease limiting speed 3,100 r/min, oil 3,600 r/min, mass about 5710 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3026K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3026K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3026K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3026K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3026 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3026K?",
        "a": "NTN rates NN3026K at 3,100 r/min with grease and 3,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3026K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3026k",
      "NN3026K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1026",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1026",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 191,
    "static_load_kN": 238,
    "fatigue_load_limit_kN": 24.9,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 3630,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU1026 denotes a 130×200×33 mm (5.118 × 7.874 × 1.299 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1026 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 148 mm and Ew 182 mm — the envelope inside the 130/200 mm bore/OD where the rollers actually run. Thermal planning around the 3,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 4,000 r/min for continuously high-duty 130 mm positions. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 4,000 r/min need positive flow and drain design; the 3630 g NU1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 191/238 kN pair here belongs to NU1026 as printed, not to the bare size.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 200×33 mm envelope matches.",
      "The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1026?",
        "a": "NU1026 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 33 mm width (5.118 × 7.874 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 238 kN, Pu 24.9 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 3630 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1026 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1026 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1026 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1026?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 148 mm, Ew 182 mm. The nominal bore/OD remain 130/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1026-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1026",
      "NU1026"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1026",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1026",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 191,
    "static_load_kN": 238,
    "fatigue_load_limit_kN": 24.9,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4000,
    "weight_g": 3630,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP1026 denotes a 130×200×33 mm (5.118 × 7.874 × 1.299 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1026 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP1026. Equivalent-load planning treats NUP1026 as a pure radial bearing: keep P below 191 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1026.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 4,000 r/min need positive flow and drain design; the 3630 g NUP1026 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1026 skids at 3,400 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NUP1026 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 200 mm race brinells and releases as vibration within hours.",
      "The 191/238 kN ratings, 24.9 kN Pu and 3630 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1026 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1026?",
        "a": "NUP1026 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 33 mm width (5.118 × 7.874 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 191 kN, C0 238 kN, Pu 24.9 kN, grease limiting speed 3,400 r/min, oil 4,000 r/min, mass about 3630 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1026 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1026 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1026 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1026?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 148 mm, Ew 182 mm. The nominal bore/OD remain 130/200 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,400 r/min grease / 4,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1026",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=151",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1026",
      "NUP1026"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2226",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2226",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 420,
    "static_load_kN": 530,
    "fatigue_load_limit_kN": 54,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2226 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 420 kN dynamic rating in the 130 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). The 50.0 mm radial section ((230−130)/2) frames the roller complement; capacity per millimetre of bore is about 3.2 kN/mm before application factors. The 3.2 kN-per-mm-bore figure (420 kN over 130 mm) lets a N2226 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 10000 g N2226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open N2226 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "Open N2226 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "If the shaft must be located both ways, do not use N2226 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 64 mm-wide cavity.",
      "The 420/530 kN ratings, 54 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2226?",
        "a": "N2226 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 530 kN, Pu 54 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 10000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2226 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2226 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2226 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2226?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2226",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2226",
      "N2226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N226",
    "brand": "NTN",
    "manufacturer_designation": "NTN N226",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 300,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 35,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3400,
    "weight_g": 6170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N226 denotes a 130×230×40 mm (5.118 × 9.055 × 1.575 in) cylindrical roller bearing in the N200 family, a pressed sheet-steel cage. Numbering ties N226 to its envelope: type code N, series N200, 130 mm bore; the 230×40 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N226 designation when purchasing. Mass 6170 g for the 130×230×40 mm N226 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g N226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 300/340 kN pair here belongs to N226 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N226?",
        "a": "N226 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N226 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N226 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N226 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N226?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N226-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n226",
      "N226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF226",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF226",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 300,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 35,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3400,
    "weight_g": 6170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF226 appears as a 130 mm bore single-row cylindrical roller bearing (300 kN C / 340 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF226 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 156 mm and Ew 204 mm — the envelope inside the 130/230 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g NF226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF226 skids at 2,900 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 2,900 r/min and oil 3,400 r/min are different limits for NF226: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 130 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 230×40 mm envelope matches.",
      "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF226?",
        "a": "NF226 is an NTN NF single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF226 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF226 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF226 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF226?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF226",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf226",
      "NF226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2226",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2226",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 420,
    "static_load_kN": 530,
    "fatigue_load_limit_kN": 54,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 130 mm shaft NTN supplies NJ2226: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,600 r/min on grease and 3,100 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2226 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ2226 designation when purchasing. Rating life at 420 kN C assumes clean oil and adequate film; the 54 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2226 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 10000 g NJ2226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "If the shaft must be located both ways, do not use NJ2226 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 420/530 kN pair here belongs to NJ2226 as printed, not to the bare size.",
      "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "The 420/530 kN ratings, 54 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2226?",
        "a": "NJ2226 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 530 kN, Pu 54 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 10000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2226 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2226 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2226 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2226?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2226-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2226",
      "NJ2226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2226E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2226E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 590,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2226E appears as a 130 mm bore single-row cylindrical roller bearing (590 kN C / 735 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 230 mm OD and 64 mm width from the ISO 15 general plan. The 50.0 mm radial section ((230−130)/2) frames the roller complement; capacity per millimetre of bore is about 4.5 kN/mm before application factors. The 130 mm (5.118 in) bore and 230 mm (9.055 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 64 mm-wide ring. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the NJ2226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NJ2226E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NJ2226E with a deep-groove ball bearing on rating alone: line contact gives 590 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NJ2226E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 64 mm-wide cavity.",
      "The 590/735 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2226E?",
        "a": "NJ2226E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 590 kN, C0 735 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2226E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2226E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2226E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2226E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2226E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2226e",
      "NJ2226E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ226",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ226",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 300,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 35,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3400,
    "weight_g": 6170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ226 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 130×230×40 mm ISO 15 envelope. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ226 floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ226 designation when purchasing. Mass 6170 g for the 130×230×40 mm NJ226 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ226 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g NJ226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NJ226 with a deep-groove ball bearing on rating alone: line contact gives 300 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 40 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ226?",
        "a": "NJ226 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ226 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ226 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ226 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ226?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ226-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj226",
      "NJ226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ226E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ226E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 405,
    "static_load_kN": 455,
    "fatigue_load_limit_kN": 46,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ226E is the standard section of the NTN NJ200 dimension series for a 130 mm shaft — 405 kN of basic dynamic capacity in a open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 230 mm OD and 40 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 2,600 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 3,100 r/min for continuously high-duty 130 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the NJ226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 405/455 kN pair here belongs to NJ226E as printed, not to the bare size.",
      "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NJ226E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 405/455 kN pair here belongs to NJ226E as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 405/455 kN pair here belongs to NJ226E as printed, not to the bare size.",
      "The 405/455 kN ratings, 46 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ226E?",
        "a": "NJ226E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 405 kN, C0 455 kN, Pu 46 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ226E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ226E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ226E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ226E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ226E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj226e",
      "NJ226E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2226",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2226",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 420,
    "static_load_kN": 530,
    "fatigue_load_limit_kN": 54,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2226 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 130×230×64 mm ISO 15 envelope. Digit by digit, NU2226 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NU2226 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 130 mm (5.118 in) bore and 230 mm (9.055 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 64 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 130 mm shaft.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 10000 g NU2226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 230×64 mm envelope matches.",
      "Open NU2226 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 420/530 kN ratings, 54 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2226?",
        "a": "NU2226 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 530 kN, Pu 54 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 10000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2226 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2226 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2226 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2226?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2226-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2226",
      "NU2226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2226E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2226E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 590,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2226E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 130×230×64 mm ISO 15 envelope. Digit by digit, NU2226E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2226E. Selection arithmetic: Pu 75 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.25 (735/590 kN) shows the high-static-capacity proportioning of this 130 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the NU2226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 590/735 kN pair here belongs to NU2226E as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 230×64 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "The 590/735 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2226E?",
        "a": "NU2226E is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 590 kN, C0 735 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2226E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2226E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2226E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2226E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2226E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2226e",
      "NU2226E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU226",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU226",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 300,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 35,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3400,
    "weight_g": 6170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU226 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 300 kN dynamic rating in the 130 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 230 mm OD and 40 mm width from the ISO 15 general plan. The 40 mm width and 50.0 mm section put the NU200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 35 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.13 (340/300 kN) shows the high-static-capacity proportioning of this 130 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU226 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g NU226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NU226 with a deep-groove ball bearing on rating alone: line contact gives 300 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "Open NU226 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU226?",
        "a": "NU226 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU226 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU226 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU226 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU226?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU226-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu226",
      "NU226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU226E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU226E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 405,
    "static_load_kN": 455,
    "fatigue_load_limit_kN": 46,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU226E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 405 kN dynamic rating in the 130 mm bore. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU226E. Rating life at 405 kN C assumes clean oil and adequate film; the 46 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the NU226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 230×40 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "The 405/455 kN ratings, 46 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU226E?",
        "a": "NU226E is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 405 kN, C0 455 kN, Pu 46 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU226E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU226E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU226E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU226E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU226E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu226e",
      "NU226E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2226",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2226",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 420,
    "static_load_kN": 530,
    "fatigue_load_limit_kN": 54,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2226 on the 130×230 mm envelope, 64 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,600 r/min. Digit by digit, NUP2226 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2226. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 130 mm shaft.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 10000 g NUP2226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 230×64 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 420/530 kN pair here belongs to NUP2226 as printed, not to the bare size.",
      "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 64 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "The 420/530 kN ratings, 54 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2226?",
        "a": "NUP2226 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 530 kN, Pu 54 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 10000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2226 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2226 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2226 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2226?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2226-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2226",
      "NUP2226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2226E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2226E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 590,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2226E denotes a 130×230×64 mm (5.118 × 9.055 × 2.52 in) cylindrical roller bearing in the NUP2200 family, the high-capacity pressed-steel cage of the E execution. Numbering ties NUP2226E to its envelope: type code NUP, series NUP2200, 130 mm bore; the 230×64 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 50.0 mm radial section ((230−130)/2) frames the roller complement; capacity per millimetre of bore is about 4.5 kN/mm before application factors. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the NUP2226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2226E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 230×64 mm envelope matches.",
      "The 64 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 64 mm-wide cavity.",
      "The 590/735 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2226E?",
        "a": "NUP2226E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 590 kN, C0 735 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2226E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2226E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2226E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2226E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2226E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2226e",
      "NUP2226E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP226",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP226",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 300,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 35,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3400,
    "weight_g": 6170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP226 is the standard section of the NTN NUP200 dimension series for a 130 mm shaft — 300 kN of basic dynamic capacity in a 6170 g, open bearing. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,900 r/min grease and 3,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 130 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,400 r/min need positive flow and drain design; the 6170 g NUP226 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NUP226 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NUP226 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 300/340 kN ratings, 35 kN Pu and 6170 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP226 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP226?",
        "a": "NUP226 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 300 kN, C0 340 kN, Pu 35 kN, grease limiting speed 2,900 r/min, oil 3,400 r/min, mass about 6170 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP226 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP226 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP226 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP226?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm, Ew 204 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,900 r/min grease / 3,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP226-ECJ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup226",
      "NUP226"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP226E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP226E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 405,
    "static_load_kN": 455,
    "fatigue_load_limit_kN": 46,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP226E appears as a 130 mm bore single-row cylindrical roller bearing (405 kN C / 455 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). The 50.0 mm radial section ((230−130)/2) frames the roller complement; capacity per millimetre of bore is about 3.1 kN/mm before application factors. Speed ratio check: limiting 2,600 r/min is .84 of the 3,100 r/min oil value for NUP226E; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the NUP226E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use NUP226E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.",
      "The 50.0 mm section at 130 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 40 mm-wide cavity.",
      "The 405/455 kN ratings, 46 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP226E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP226E?",
        "a": "NUP226E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 40 mm width (5.118 × 9.055 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 405 kN, C0 455 kN, Pu 46 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP226E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP226E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP226E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP226E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 153.5 mm. The nominal bore/OD remain 130/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP226E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup226e",
      "NUP226E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2326",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2326",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 930,
    "static_load_kN": 1130,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 26400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2326 appears as a 130 mm bore single-row cylindrical roller bearing (930 kN C / 1130 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N2326 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,200 r/min grease and 2,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 130 mm bore. Speed ratio check: limiting 2,200 r/min is .85 of the 2,600 r/min oil value for N2326; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 130 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 26400 g N2326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N2326 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2326 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The 75.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 93 mm-wide cavity.",
      "If the shaft must be located both ways, do not use N2326 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 930/1130 kN ratings, 111 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2326?",
        "a": "N2326 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 930 kN, C0 1130 kN, Pu 111 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 26400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2326 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2326 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2326 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2326?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2326",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2326",
      "N2326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N326",
    "brand": "NTN",
    "manufacturer_designation": "NTN N326",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 620,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 65.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N326 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 130×280×58 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 280 mm OD and 58 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 167 mm and Ew 243 mm — the envelope inside the 130/280 mm bore/OD where the rollers actually run. The 4.8 kN-per-mm-bore figure (620 kN over 130 mm) lets a N326 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N326 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g N326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for N326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The N rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.",
      "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N326?",
        "a": "N326 is an NTN N single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N326 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N326 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N326 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N326?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N326-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n326",
      "N326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF326",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF326",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 620,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 65.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF326 is the standard section of the NTN NF300 dimension series for a 130 mm shaft — 620 kN of basic dynamic capacity in a 17000 g, open bearing. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). At 2,900 r/min with oil versus 2,500 r/min with grease (a 400 r/min band), lubrication choice for NF326 is a thermal decision, not just a sealing one. Speed ratio check: limiting 2,500 r/min is .86 of the 2,900 r/min oil value for NF326; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF326.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g NF326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 620/665 kN pair here belongs to NF326 as printed, not to the bare size.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 130 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NF326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF326?",
        "a": "NF326 is an NTN NF single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF326 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF326 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF326 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF326?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF326",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf326",
      "NF326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2326",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2326",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 930,
    "static_load_kN": 1130,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 26400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2326 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 930 kN dynamic rating in the 130 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 167 mm and Ew 243 mm — the envelope inside the 130/280 mm bore/OD where the rollers actually run. Thermal planning around the 2,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,600 r/min for continuously high-duty 130 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 26400 g NJ2326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 280×93 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 930/1130 kN pair here belongs to NJ2326 as printed, not to the bare size.",
      "Open NJ2326 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 280×93 mm envelope matches.",
      "The 930/1130 kN ratings, 111 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2326?",
        "a": "NJ2326 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 930 kN, C0 1130 kN, Pu 111 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 26400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2326 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2326 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2326 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2326?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2326-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×93 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2326",
      "NJ2326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2326E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2326E",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1230,
    "fatigue_load_limit_kN": 121,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2326E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1020 kN dynamic rating in the 130 mm bore. Numbering ties NJ2326E to its envelope: type code NJ, series NJ2300, 130 mm bore; the 280×93 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 2,000 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,300 r/min for continuously high-duty 130 mm positions. Housing and shaft fillets must clear the ring chamfers of NJ2326E; an oversized radius locks the ring on its face and tilts the 93 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NJ2326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 93 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NJ2326E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1230 kN pair here belongs to NJ2326E as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1230 kN pair here belongs to NJ2326E as printed, not to the bare size.",
      "The 1020/1230 kN ratings, 121 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2326E?",
        "a": "NJ2326E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1230 kN, Pu 121 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2326E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2326E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2326E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2326E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2326E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2326e",
      "NJ2326E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ326",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ326",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 620,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 65.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ326 on the 130×280 mm envelope, 58 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,500 r/min. Digit by digit, NJ326 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 2,900 r/min with oil versus 2,500 r/min with grease (a 400 r/min band), lubrication choice for NJ326 is a thermal decision, not just a sealing one. Equivalent-load planning treats NJ326 as a pure radial bearing: keep P below 620 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ326 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g NJ326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NJ326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ326 skids at 2,500 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NJ326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ326?",
        "a": "NJ326 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ326 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ326 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ326 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ326?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ326-ECJ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj326",
      "NJ326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ326E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ326E",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 685,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ326E appears as a 130 mm bore single-row cylindrical roller bearing (685 kN C / 735 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NJ326E to its envelope: type code NJ, series NJ300, 130 mm bore; the 280×58 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,600 r/min with oil versus 2,200 r/min with grease (a 400 r/min band), lubrication choice for NJ326E is a thermal decision, not just a sealing one. Mass Dimensions 130×280×58 mm and the 685 kN C rating define the substitution envelope; check the 2203E mass column for this exact NJ326E execution. Housing and shaft fillets must clear the ring chamfers of NJ326E; an oversized radius locks the ring on its face and tilts the 58 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NJ326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ326E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 130 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.",
      "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NJ326E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 685/735 kN ratings, 72 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ326E?",
        "a": "NJ326E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 735 kN, Pu 72 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ326E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ326E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ326E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ326E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ326E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj326e",
      "NJ326E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2326",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2326",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 930,
    "static_load_kN": 1130,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 26400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU2326 on the 130×280 mm envelope, 93 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,200 r/min. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 280 mm OD and 93 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU2326 designation when purchasing. Mass 26400 g for the 130×280×93 mm NU2326 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 130 mm shaft.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 26400 g NU2326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 75.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 93 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2326 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "Open NU2326 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "The 93 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "The 930/1130 kN ratings, 111 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2326?",
        "a": "NU2326 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 930 kN, C0 1130 kN, Pu 111 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 26400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2326 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2326 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2326 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2326?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2326-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×93 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2326",
      "NU2326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2326E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2326E",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1230,
    "fatigue_load_limit_kN": 121,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2326E denotes a 130×280×93 mm (5.118 × 11.024 × 3.661 in) cylindrical roller bearing in the NU2300 family, the high-capacity pressed-steel cage of the E execution. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NU2326E designation when purchasing. The 7.8 kN-per-mm-bore figure (1020 kN over 130 mm) lets a NU2326E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NU2326E; an oversized radius locks the ring on its face and tilts the 93 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NU2326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 280×93 mm envelope matches.",
      "If the shaft must be located both ways, do not use NU2326E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 93 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "The 1020/1230 kN ratings, 121 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2326E?",
        "a": "NU2326E is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1230 kN, Pu 121 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2326E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2326E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2326E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2326E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2326E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2326e",
      "NU2326E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU326",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU326",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 620,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 65.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU326 appears as a 130 mm bore single-row cylindrical roller bearing (620 kN C / 665 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 130 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU326. Speed ratio check: limiting 2,500 r/min is .86 of the 2,900 r/min oil value for NU326; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU326 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g NU326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NU326: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NU326 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.",
      "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU326?",
        "a": "NU326 is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU326 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU326 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU326 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU326?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU326-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu326",
      "NU326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU326E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU326E",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 685,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 130 mm shaft NTN supplies NU326E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU326E floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 167 mm — the envelope inside the 130/280 mm bore/OD where the rollers actually run. Mass Dimensions 130×280×58 mm and the 685 kN C rating define the substitution envelope; check the 2203E mass column for this exact NU326E execution. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NU326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU326E skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "Open NU326E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 130 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 280×58 mm envelope matches.",
      "The 685/735 kN ratings, 72 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU326E?",
        "a": "NU326E is an NTN NU single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 735 kN, Pu 72 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU326E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU326E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU326E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU326E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU326E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu326e",
      "NU326E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2326",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2326",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 930,
    "static_load_kN": 1130,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 26400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 130 mm shaft NTN supplies NUP2326: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 130 mm, with 280 mm OD and 93 mm width from the ISO 15 general plan. With C 930 kN and C0 1130 kN (C0/C ≈ 1.22) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 130 mm (5.118 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 93 mm-wide ring. Heat the inner ring to max 120 °C for the 130 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 26400 g NUP2326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 75.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 93 mm-wide cavity.",
      "The 93 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 130 mm inner ring.",
      "Do not replace NUP2326 with a deep-groove ball bearing on rating alone: line contact gives 930 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2326 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The 930/1130 kN ratings, 111 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2326?",
        "a": "NUP2326 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 930 kN, C0 1130 kN, Pu 111 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 26400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2326 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2326 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2326 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2326?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2326-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×93 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2326",
      "NUP2326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2326E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2326E",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1230,
    "fatigue_load_limit_kN": 121,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2326E is the extra-wide (23) section of the NTN NUP2300 dimension series for a 130 mm shaft — 1020 kN of basic dynamic capacity in a open bearing. Digit by digit, NUP2326E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 130 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NUP2326E as a pure radial bearing: keep P below 1020 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP2326E; an oversized radius locks the ring on its face and tilts the 93 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NUP2326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NUP2326E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NUP2326E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "Open NUP2326E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 130 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1230 kN pair here belongs to NUP2326E as printed, not to the bare size.",
      "The 1020/1230 kN ratings, 121 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2326E?",
        "a": "NUP2326E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1230 kN, Pu 121 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2326E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2326E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2326E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2326E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2326E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2326e",
      "NUP2326E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP326",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP326",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 620,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 65.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP326 denotes a 130×280×58 mm (5.118 × 11.024 × 2.283 in) cylindrical roller bearing in the NUP300 family, a pressed sheet-steel cage. Numbering ties NUP326 to its envelope: type code NUP, series NUP300, 130 mm bore; the 280×58 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 620 kN and C0 665 kN (C0/C ≈ 1.07) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Rating life at 620 kN C assumes clean oil and adequate film; the 65.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 17000 g NUP326 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 620/665 kN pair here belongs to NUP326 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 130 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 75.0 mm section at 130 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP326 skids at 2,500 r/min and fails by smearing long before L10 fatigue.",
      "The 620/665 kN ratings, 65.5 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP326 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP326?",
        "a": "NUP326 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 620 kN, C0 665 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 17000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP326 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP326 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP326 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP326?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm, Ew 243 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP326-ECP",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup326",
      "NUP326"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP326E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP326E",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 685,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP326E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 685 kN dynamic rating in the 130 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP326E floats or locates; the numeric remainder is the ISO 15 series and 130 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 130 mm (5.118 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 58 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP326E.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 130 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NUP326E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP326E skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 685/735 kN pair here belongs to NUP326E as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP326E skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 685/735 kN pair here belongs to NUP326E as printed, not to the bare size.",
      "The 685/735 kN ratings, 72 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP326E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP326E?",
        "a": "NUP326E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 58 mm width (5.118 × 11.024 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 735 kN, Pu 72 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP326E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP326E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP326E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP326E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 167 mm. The nominal bore/OD remain 130/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP326E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup326e",
      "NUP326E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4928",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4928",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 190,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 251,
    "static_load_kN": 470,
    "fatigue_load_limit_kN": 49,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3600,
    "weight_g": 3760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NN4928: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 3,000 r/min on grease and 3,600 r/min on oil. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4928 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. The 140 mm (5.512 in) bore and 190 mm (7.48 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 50 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 140 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 3760 g NN4928 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN4928 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 190×50 mm envelope matches.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4928 does not substitute a precision-class execution.",
      "The 50 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The 251/470 kN ratings, 49 kN Pu and 3760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4928 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4928?",
        "a": "NN4928 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 190 mm OD and 50 mm width (5.512 × 7.48 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 251 kN, C0 470 kN, Pu 49 kN, grease limiting speed 3,000 r/min, oil 3,600 r/min, mass about 3760 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4928 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4928 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4928?",
        "a": "NN4928 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4928?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm. The nominal bore/OD remain 140/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4928",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4928",
      "NN4928"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4928K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4928K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 190,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 251,
    "static_load_kN": 470,
    "fatigue_load_limit_kN": 49,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3600,
    "weight_g": 3580,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NN4928K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 3,000 r/min on grease and 3,600 r/min on oil. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 190 mm OD and 50 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 3,000 r/min grease and 3,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. Thermal planning around the 3,000 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 3,600 r/min for continuously high-duty 140 mm positions. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 3580 g NN4928K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The K tapered bore of NN4928K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 190×50 mm envelope matches.",
      "Open NN4928K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "The K tapered bore of NN4928K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The 251/470 kN ratings, 49 kN Pu and 3580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4928K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4928K?",
        "a": "NN4928K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 190 mm OD and 50 mm width (5.512 × 7.48 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 251 kN, C0 470 kN, Pu 49 kN, grease limiting speed 3,000 r/min, oil 3,600 r/min, mass about 3580 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4928K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4928K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4928K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4928K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4928 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4928K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm. The nominal bore/OD remain 140/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4928K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4928k",
      "NN4928K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4928K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4928K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 190,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 251,
    "static_load_kN": 470,
    "fatigue_load_limit_kN": 49,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3600,
    "weight_g": 3760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NNU4928K denotes a 140×190×50 mm (5.512 × 7.48 × 1.969 in) cylindrical roller bearing in the NNU4900 family, a machined or stamped steel cage per the precision execution. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 49 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.87 (470/251 kN) shows the high-static-capacity proportioning of this 140 mm bore. Housing and shaft fillets must clear the ring chamfers of NNU4928K; an oversized radius locks the ring on its face and tilts the 50 mm-wide seat.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,600 r/min need positive flow and drain design; the 3760 g NNU4928K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 190×50 mm envelope matches.",
      "Grease limiting speed 3,000 r/min and oil 3,600 r/min are different limits for NNU4928K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 251/470 kN pair here belongs to NNU4928K as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 251/470 kN pair here belongs to NNU4928K as printed, not to the bare size.",
      "The 251/470 kN ratings, 49 kN Pu and 3760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4928K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4928K?",
        "a": "NNU4928K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 190 mm OD and 50 mm width (5.512 × 7.48 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 251 kN, C0 470 kN, Pu 49 kN, grease limiting speed 3,000 r/min, oil 3,600 r/min, mass about 3760 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4928K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4928K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4928K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4928K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4928 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4928K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 156 mm. The nominal bore/OD remain 140/190 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4928K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4928k",
      "NNU4928K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1028",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1028",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 195,
    "static_load_kN": 250,
    "fatigue_load_limit_kN": 25.7,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 3980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1028 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 195 kN dynamic rating in the 140 mm bore. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 210 mm OD and 33 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1028 designation when purchasing. Rating life at 195 kN C assumes clean oil and adequate film; the 25.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,800 r/min need positive flow and drain design; the 3980 g N1028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N1028 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 3,200 r/min and oil 3,800 r/min are different limits for N1028: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.",
      "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The 195/250 kN ratings, 25.7 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1028?",
        "a": "N1028 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 33 mm width (5.512 × 8.268 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 195 kN, C0 250 kN, Pu 25.7 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1028 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1028 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1028 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1028?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 158 mm, Ew 192 mm. The nominal bore/OD remain 140/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1028",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1028",
      "N1028"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1028",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1028",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 195,
    "static_load_kN": 250,
    "fatigue_load_limit_kN": 25.7,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 3980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NJ1028: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 3,200 r/min on grease and 3,800 r/min on oil. Numbering ties NJ1028 to its envelope: type code NJ, series NJ1000, 140 mm bore; the 210×33 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 195 kN and C0 250 kN (C0/C ≈ 1.28) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 1.4 kN-per-mm-bore figure (195 kN over 140 mm) lets a NJ1028 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 140 mm shaft.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,800 r/min need positive flow and drain design; the 3980 g NJ1028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 210×33 mm envelope matches.",
      "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.",
      "Open NJ1028 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1028 skids at 3,200 r/min and fails by smearing long before L10 fatigue.",
      "The 195/250 kN ratings, 25.7 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1028?",
        "a": "NJ1028 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 33 mm width (5.512 × 8.268 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 195 kN, C0 250 kN, Pu 25.7 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1028 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1028 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1028 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1028?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 158 mm, Ew 192 mm. The nominal bore/OD remain 140/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1028",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1028",
      "NJ1028"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3028",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3028",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 330,
    "static_load_kN": 515,
    "fatigue_load_limit_kN": 53,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 6440,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3028 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 140×210×53 mm ISO 15 envelope. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Equivalent-load planning treats NN3028 as a pure radial bearing: keep P below 330 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3028.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 6440 g NN3028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,800 r/min and oil 3,300 r/min are different limits for NN3028: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 210×53 mm envelope matches.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3028 does not substitute a precision-class execution.",
      "The 53 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The 330/515 kN ratings, 53 kN Pu and 6440 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3028?",
        "a": "NN3028 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 515 kN, Pu 53 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 6440 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3028 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3028 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3028?",
        "a": "NN3028 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3028?",
        "a": "NTN rates NN3028 at 2,800 r/min with grease and 3,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3028",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3028",
      "NN3028"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3028K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3028K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 330,
    "static_load_kN": 515,
    "fatigue_load_limit_kN": 53,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 6210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3028K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 140×210×53 mm ISO 15 envelope. Numbering ties NN3028K to its envelope: type code NN, series NN3000, 140 mm bore; the 210×53 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 53 mm width and 35.0 mm section put the NN3000 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 2,800 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 3,300 r/min for continuously high-duty 140 mm positions. Housing and shaft fillets must clear the ring chamfers of NN3028K; an oversized radius locks the ring on its face and tilts the 53 mm-wide seat.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 6210 g NN3028K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 140 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 210×53 mm envelope matches.",
      "Grease limiting speed 2,800 r/min and oil 3,300 r/min are different limits for NN3028K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 53 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "Open NN3028K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "The 330/515 kN ratings, 53 kN Pu and 6210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3028K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3028K?",
        "a": "NN3028K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 330 kN, C0 515 kN, Pu 53 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 6210 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3028K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3028K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3028K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3028K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3028 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3028K?",
        "a": "NTN rates NN3028K at 2,800 r/min with grease and 3,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3028K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3028k",
      "NN3028K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1028",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1028",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 195,
    "static_load_kN": 250,
    "fatigue_load_limit_kN": 25.7,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 3980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1028 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 140×210×33 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1028. Speed ratio check: limiting 3,200 r/min is .84 of the 3,800 r/min oil value for NU1028; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1028.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,800 r/min need positive flow and drain design; the 3980 g NU1028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.",
      "Grease limiting speed 3,200 r/min and oil 3,800 r/min are different limits for NU1028: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NU1028 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 210 mm race brinells and releases as vibration within hours.",
      "The 195/250 kN ratings, 25.7 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1028?",
        "a": "NU1028 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 33 mm width (5.512 × 8.268 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 195 kN, C0 250 kN, Pu 25.7 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1028 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1028 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1028 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1028?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 158 mm, Ew 192 mm. The nominal bore/OD remain 140/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1028-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1028",
      "NU1028"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1028",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1028",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 195,
    "static_load_kN": 250,
    "fatigue_load_limit_kN": 25.7,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 3800,
    "weight_g": 3980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1028 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 140×210×33 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1028 designation when purchasing. Mass 3980 g for the 140×210×33 mm NUP1028 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP1028; an oversized radius locks the ring on its face and tilts the 33 mm-wide seat.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,800 r/min need positive flow and drain design; the 3980 g NUP1028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.",
      "The 35.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 33 mm-wide cavity.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 210×33 mm envelope matches.",
      "The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The 195/250 kN ratings, 25.7 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1028 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1028?",
        "a": "NUP1028 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 33 mm width (5.512 × 8.268 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 195 kN, C0 250 kN, Pu 25.7 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1028 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1028 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1028 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1028?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 158 mm, Ew 192 mm. The nominal bore/OD remain 140/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1028",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1028",
      "NUP1028"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2228",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2228",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 495,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2228 appears as a 140 mm bore single-row cylindrical roller bearing (495 kN C / 635 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N2228 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Rating life at 495 kN C assumes clean oil and adequate film; the 63.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 140 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 12600 g N2228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2228 skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The N rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 250×68 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 495/635 kN pair here belongs to N2228 as printed, not to the bare size.",
      "The 495/635 kN ratings, 63.5 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2228?",
        "a": "N2228 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 635 kN, Pu 63.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 12600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2228 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2228 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2228 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2228?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2228",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2228",
      "N2228"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N228",
    "brand": "NTN",
    "manufacturer_designation": "NTN N228",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 345,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 39.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3100,
    "weight_g": 7720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N228 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 140×250×42 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 250 mm OD and 42 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 2,700 r/min grease and 3,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. The 140 mm (5.512 in) bore and 250 mm (9.843 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 42 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 140 mm shaft.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g N228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 42 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for N228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for N228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use N228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N228?",
        "a": "N228 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N228 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N228 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N228 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N228?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N228",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n228",
      "N228"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF228",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF228",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 345,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 39.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3100,
    "weight_g": 7720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF228 is the standard section of the NTN NF200 dimension series for a 140 mm shaft — 345 kN of basic dynamic capacity in a 7720 g, open bearing. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF228. Thermal planning around the 2,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,100 r/min for continuously high-duty 140 mm positions. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g NF228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NF228 with a deep-groove ball bearing on rating alone: line contact gives 345 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NF228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.",
      "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF228?",
        "a": "NF228 is an NTN NF single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF228 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF228 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF228 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF228?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF228",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf228",
      "NF228"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2228",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2228",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 495,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2228 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 495 kN dynamic rating in the 140 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,400 r/min grease and 2,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 12600 g NJ2228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 55.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 250×68 mm envelope matches.",
      "Open NJ2228 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "If the shaft must be located both ways, do not use NJ2228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 495/635 kN ratings, 63.5 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2228?",
        "a": "NJ2228 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 635 kN, Pu 63.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 12600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2228 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2228 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2228 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2228?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2228-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2228",
      "NJ2228"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2228E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2228E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 635,
    "static_load_kN": 835,
    "fatigue_load_limit_kN": 83,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2228E is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 140×250×68 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). At 2,500 r/min with oil versus 2,100 r/min with grease (a 400 r/min band), lubrication choice for NJ2228E is a thermal decision, not just a sealing one. Thermal planning around the 2,100 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,500 r/min for continuously high-duty 140 mm positions. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NJ2228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 55.0 mm section at 140 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2228E skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 635/835 kN pair here belongs to NJ2228E as printed, not to the bare size.",
      "Grease limiting speed 2,100 r/min and oil 2,500 r/min are different limits for NJ2228E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 635/835 kN ratings, 83 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2228E?",
        "a": "NJ2228E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 635 kN, C0 835 kN, Pu 83 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2228E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2228E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2228E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2228E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2228E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2228e",
      "NJ2228E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ228",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ228",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 345,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 39.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3100,
    "weight_g": 7720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ228 on the 140×250 mm envelope, 42 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,700 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,700 r/min grease and 3,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. The 140 mm (5.512 in) bore and 250 mm (9.843 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 42 mm-wide ring. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g NJ228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 250×42 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NJ228 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ228?",
        "a": "NJ228 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ228 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ228 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ228 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ228?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ228-ECJ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj228",
      "NJ228"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ228E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ228E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 435,
    "static_load_kN": 515,
    "fatigue_load_limit_kN": 51,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ228E on the 140×250 mm envelope, 42 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,400 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 140 mm (00–03 use the 10/12/15/17 exception table). With C 435 kN and C0 515 kN (C0/C ≈ 1.18) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Mass Dimensions 140×250×42 mm and the 435 kN C rating define the substitution envelope; check the 2203E mass column for this exact NJ228E execution. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NJ228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NJ228E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 250×42 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ228E skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "The 435/515 kN ratings, 51 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ228E?",
        "a": "NJ228E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 435 kN, C0 515 kN, Pu 51 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ228E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ228E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ228E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ228E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ228E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj228e",
      "NJ228E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2228",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2228",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 495,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU2228 on the 140×250 mm envelope, 68 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,400 r/min. Numbering ties NU2228 to its envelope: type code NU, series NU2200, 140 mm bore; the 250×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 55.0 mm radial section ((250−140)/2) frames the roller complement; capacity per millimetre of bore is about 3.5 kN/mm before application factors. The 3.5 kN-per-mm-bore figure (495 kN over 140 mm) lets a NU2228 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2228 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 12600 g NU2228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU2228 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NU2228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 55.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "The 495/635 kN ratings, 63.5 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2228?",
        "a": "NU2228 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 635 kN, Pu 63.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 12600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2228 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2228 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2228 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2228?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2228-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2228",
      "NU2228"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2228E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2228E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 635,
    "static_load_kN": 835,
    "fatigue_load_limit_kN": 83,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2228E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 635 kN dynamic rating in the 140 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 250 mm OD and 68 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 2,100 r/min grease and 2,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. The 4.5 kN-per-mm-bore figure (635 kN over 140 mm) lets a NU2228E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NU2228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NU2228E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NU2228E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 635/835 kN ratings, 83 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2228E?",
        "a": "NU2228E is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 635 kN, C0 835 kN, Pu 83 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2228E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2228E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2228E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2228E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2228E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2228e",
      "NU2228E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU228",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU228",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 345,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 39.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3100,
    "weight_g": 7720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU228 appears as a 140 mm bore single-row cylindrical roller bearing (345 kN C / 400 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU228 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU228 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NU228 as a pure radial bearing: keep P below 345 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g NU228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 140 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 250×42 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for NU228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU228?",
        "a": "NU228 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU228 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU228 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU228 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU228?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU228-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu228",
      "NU228"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU228E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU228E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 435,
    "static_load_kN": 515,
    "fatigue_load_limit_kN": 51,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU228E denotes a 140×250×42 mm (5.512 × 9.843 × 1.654 in) cylindrical roller bearing in the NU200 family, the high-capacity pressed-steel cage of the E execution. Numbering ties NU228E to its envelope: type code NU, series NU200, 140 mm bore; the 250×42 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 2,400 r/min grease and 2,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. Selection arithmetic: Pu 51 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.18 (515/435 kN) shows the high-static-capacity proportioning of this 140 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU228E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NU228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU228E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NU228E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NU228E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 435/515 kN ratings, 51 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU228E?",
        "a": "NU228E is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 435 kN, C0 515 kN, Pu 51 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU228E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU228E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU228E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU228E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU228E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu228e",
      "NU228E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2228",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2228",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 495,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NUP2228: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,400 r/min on grease and 2,800 r/min on oil. Numbering ties NUP2228 to its envelope: type code NUP, series NUP2200, 140 mm bore; the 250×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2228 designation when purchasing. Thermal planning around the 2,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,800 r/min for continuously high-duty 140 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2228 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the 12600 g NUP2228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2228 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "Open NUP2228 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "Do not replace NUP2228 with a deep-groove ball bearing on rating alone: line contact gives 495 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The 495/635 kN ratings, 63.5 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2228?",
        "a": "NUP2228 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 635 kN, Pu 63.5 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min, mass about 12600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2228 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2228 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2228 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2228?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2228-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2228",
      "NUP2228"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2228E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2228E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 635,
    "static_load_kN": 835,
    "fatigue_load_limit_kN": 83,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NUP2228E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,100 r/min on grease and 2,500 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2228E floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. At 2,500 r/min with oil versus 2,100 r/min with grease (a 400 r/min band), lubrication choice for NUP2228E is a thermal decision, not just a sealing one. Equivalent-load planning treats NUP2228E as a pure radial bearing: keep P below 635 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the NUP2228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP2228E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NUP2228E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "Grease limiting speed 2,100 r/min and oil 2,500 r/min are different limits for NUP2228E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 635/835 kN ratings, 83 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2228E?",
        "a": "NUP2228E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 635 kN, C0 835 kN, Pu 83 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2228E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2228E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2228E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2228E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2228E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2228e",
      "NUP2228E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP228",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP228",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 345,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 39.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3100,
    "weight_g": 7720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP228 denotes a 140×250×42 mm (5.512 × 9.843 × 1.654 in) cylindrical roller bearing in the NUP200 family, a pressed sheet-steel cage. Digit by digit, NUP228 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP228 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 2,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,100 r/min for continuously high-duty 140 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP228.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7720 g NUP228 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 2,700 r/min and oil 3,100 r/min are different limits for NUP228: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 250×42 mm envelope matches.",
      "Do not replace NUP228 with a deep-groove ball bearing on rating alone: line contact gives 345 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 345/400 kN ratings, 39.5 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP228 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP228?",
        "a": "NUP228 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 345 kN, C0 400 kN, Pu 39.5 kN, grease limiting speed 2,700 r/min, oil 3,100 r/min, mass about 7720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP228 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP228 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP228 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP228?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm, Ew 221 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,700 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP228-ECJ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup228",
      "NUP228"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP228E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP228E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 435,
    "static_load_kN": 515,
    "fatigue_load_limit_kN": 51,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP228E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 140×250×42 mm ISO 15 envelope. Numbering ties NUP228E to its envelope: type code NUP, series NUP200, 140 mm bore; the 250×42 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,800 r/min with oil versus 2,400 r/min with grease (a 400 r/min band), lubrication choice for NUP228E is a thermal decision, not just a sealing one. The 140 mm (5.512 in) bore and 250 mm (9.843 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 42 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP228E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,800 r/min need positive flow and drain design; the NUP228E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP228E with a deep-groove ball bearing on rating alone: line contact gives 435 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NUP228E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP228E skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 2,400 r/min and oil 2,800 r/min are different limits for NUP228E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 435/515 kN ratings, 51 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP228E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP228E?",
        "a": "NUP228E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 42 mm width (5.512 × 9.843 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 435 kN, C0 515 kN, Pu 51 kN, grease limiting speed 2,400 r/min, oil 2,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP228E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP228E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP228E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP228E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169 mm. The nominal bore/OD remain 140/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP228E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup228e",
      "NUP228E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2328",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2328",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 33100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2328 is the extra-wide (23) section of the NTN N2300 dimension series for a 140 mm shaft — 1020 kN of basic dynamic capacity in a 33100 g, open bearing. Numbering ties N2328 to its envelope: type code N, series N2300, 140 mm bore; the 300×102 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2328 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 120 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.23 (1250/1020 kN) shows the high-static-capacity proportioning of this 140 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 140 mm shaft.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 33100 g N2328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1250 kN pair here belongs to N2328 as printed, not to the bare size.",
      "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 102 mm-wide cavity.",
      "Do not replace N2328 with a deep-groove ball bearing on rating alone: line contact gives 1020 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace N2328 with a deep-groove ball bearing on rating alone: line contact gives 1020 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1020/1250 kN ratings, 120 kN Pu and 33100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2328?",
        "a": "N2328 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1250 kN, Pu 120 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 33100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2328 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2328 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2328 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2328?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2328",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2328",
      "N2328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N328",
    "brand": "NTN",
    "manufacturer_designation": "NTN N328",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 685,
    "static_load_kN": 745,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 20700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N328 on the 140×300 mm envelope, 62 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,300 r/min. On the NTN nameplate N states which ring carries the ribs, which determines whether N328 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N328. Rating life at 685 kN C assumes clean oil and adequate film; the 72 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g N328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 300×62 mm envelope matches.",
      "If the shaft must be located both ways, do not use N328 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.",
      "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N328?",
        "a": "N328 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N328 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N328 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N328 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N328?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N328",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n328",
      "N328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF328",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF328",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 685,
    "static_load_kN": 745,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 20700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NF328 denotes a 140×300×62 mm (5.512 × 11.811 × 2.441 in) cylindrical roller bearing in the NF300 family, a pressed sheet-steel cage. Digit by digit, NF328 reads as NF (one rib on each ring), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 685 kN and C0 745 kN (C0/C ≈ 1.09) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Selection arithmetic: Pu 72 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.09 (745/685 kN) shows the high-static-capacity proportioning of this 140 mm bore. Housing and shaft fillets must clear the ring chamfers of NF328; an oversized radius locks the ring on its face and tilts the 62 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g NF328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 685/745 kN pair here belongs to NF328 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NF328 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF328 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF328?",
        "a": "NF328 is an NTN NF single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF328 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF328 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF328 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF328?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF328",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf328",
      "NF328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2328",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2328",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 33100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2328 appears as a 140 mm bore single-row cylindrical roller bearing (1020 kN C / 1250 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NJ2328 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2328. Speed ratio check: limiting 2,000 r/min is .87 of the 2,300 r/min oil value for NJ2328; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2328.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 33100 g NJ2328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2328 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "Open NJ2328 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 140 mm contact.",
      "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.",
      "The 1020/1250 kN ratings, 120 kN Pu and 33100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2328?",
        "a": "NJ2328 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1250 kN, Pu 120 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 33100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2328 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2328 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2328 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2328?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2328-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2328",
      "NJ2328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2328E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2328E",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1380,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ2328E denotes a 140×300×102 mm (5.512 × 11.811 × 4.016 in) cylindrical roller bearing in the NJ2300 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2328E floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. With C 1130 kN and C0 1380 kN (C0/C ≈ 1.22) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Mass Dimensions 140×300×102 mm and the 1130 kN C rating define the substitution envelope; check the 2203E mass column for this exact NJ2328E execution. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2328E.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NJ2328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 300×102 mm envelope matches.",
      "Do not replace NJ2328E with a deep-groove ball bearing on rating alone: line contact gives 1130 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 300×102 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2328E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The 1130/1380 kN ratings, 133 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2328E?",
        "a": "NJ2328E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1380 kN, Pu 133 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2328E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2328E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2328E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2328E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2328E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2328e",
      "NJ2328E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ328",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ328",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 685,
    "static_load_kN": 745,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 20700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NJ328: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,300 r/min on grease and 2,700 r/min on oil. Numbering ties NJ328 to its envelope: type code NJ, series NJ300, 140 mm bore; the 300×62 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 685 kN and C0 745 kN (C0/C ≈ 1.09) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Mass 20700 g for the 140×300×62 mm NJ328 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g NJ328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 62 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 62 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ328 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ328?",
        "a": "NJ328 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ328 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ328 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ328 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ328?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ328-ECJ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj328",
      "NJ328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ328E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ328E",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 795,
    "fatigue_load_limit_kN": 76.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ328E is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 140×300×62 mm ISO 15 envelope. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ328E floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 180 mm — the envelope inside the 140/300 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ328E.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NJ328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ328E skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 2,100 r/min and oil 2,400 r/min are different limits for NJ328E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NJ328E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 300×62 mm envelope matches.",
      "The 735/795 kN ratings, 76.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ328E?",
        "a": "NJ328E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 795 kN, Pu 76.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ328E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ328E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ328E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ328E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ328E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj328e",
      "NJ328E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2328",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2328",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 33100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NU2328: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,000 r/min on grease and 2,300 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2328 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 2,000 r/min grease and 2,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 140 mm bore. The 140 mm (5.512 in) bore and 300 mm (11.811 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 102 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2328 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 33100 g NU2328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.",
      "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 102 mm-wide cavity.",
      "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "If the shaft must be located both ways, do not use NU2328 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1020/1250 kN ratings, 120 kN Pu and 33100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2328?",
        "a": "NU2328 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1250 kN, Pu 120 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 33100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2328 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2328 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2328 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2328?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2328-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2328",
      "NU2328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2328E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2328E",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1380,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 140 mm shaft NTN supplies NU2328E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,800 r/min on grease and 2,100 r/min on oil. Numbering ties NU2328E to its envelope: type code NU, series NU2300, 140 mm bore; the 300×102 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NU2328E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,800 r/min is .86 of the 2,100 r/min oil value for NU2328E; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2328E.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NU2328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2328E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NU2328E with a deep-groove ball bearing on rating alone: line contact gives 1130 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1130/1380 kN ratings, 133 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2328E?",
        "a": "NU2328E is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1380 kN, Pu 133 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2328E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2328E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2328E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2328E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2328E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2328e",
      "NU2328E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU328",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU328",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 685,
    "static_load_kN": 745,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 20700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU328 is the standard section of the NTN NU300 dimension series for a 140 mm shaft — 685 kN of basic dynamic capacity in a 20700 g, open bearing. Digit by digit, NU328 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU328 designation when purchasing. Selection arithmetic: Pu 72 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.09 (745/685 kN) shows the high-static-capacity proportioning of this 140 mm bore. Heat the inner ring to max 120 °C for the 140 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g NU328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 62 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 140 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU328?",
        "a": "NU328 is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU328 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU328 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU328 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU328?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU328-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu328",
      "NU328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU328E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU328E",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 795,
    "fatigue_load_limit_kN": 76.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU328E is the standard section of the NTN NU300 dimension series for a 140 mm shaft — 735 kN of basic dynamic capacity in a open bearing. Digit by digit, NU328E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NU328E designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU328E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NU328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/795 kN pair here belongs to NU328E as printed, not to the bare size.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 140 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 300×62 mm envelope matches.",
      "If the shaft must be located both ways, do not use NU328E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "The 735/795 kN ratings, 76.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU328E?",
        "a": "NU328E is an NTN NU single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 795 kN, Pu 76.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU328E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU328E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU328E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU328E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU328E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu328e",
      "NU328E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2328",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2328",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 33100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2328 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1020 kN dynamic rating in the 140 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2328 floats or locates; the numeric remainder is the ISO 15 series and 140 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 180 mm and Ew 260 mm — the envelope inside the 140/300 mm bore/OD where the rollers actually run. The 7.3 kN-per-mm-bore figure (1020 kN over 140 mm) lets a NUP2328 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 33100 g NUP2328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2328 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 300×102 mm envelope matches.",
      "The 1020/1250 kN ratings, 120 kN Pu and 33100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2328?",
        "a": "NUP2328 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1250 kN, Pu 120 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 33100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2328 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2328 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2328 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2328?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2328-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2328",
      "NUP2328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2328E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2328E",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1380,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2328E on the 140×300 mm envelope, 102 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,800 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 300 mm OD and 102 mm width from the ISO 15 general plan. With C 1130 kN and C0 1380 kN (C0/C ≈ 1.22) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Rating life at 1130 kN C assumes clean oil and adequate film; the 133 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2328E.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NUP2328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80.0 mm section at 140 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 102 mm-wide cavity.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 300×102 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1130/1380 kN pair here belongs to NUP2328E as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2328E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The 1130/1380 kN ratings, 133 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2328E?",
        "a": "NUP2328E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1380 kN, Pu 133 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2328E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2328E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2328E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2328E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2328E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2328e",
      "NUP2328E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP328",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP328",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 685,
    "static_load_kN": 745,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 20700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP328 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 140×300×62 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 300 mm OD and 62 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 180 mm and Ew 260 mm — the envelope inside the 140/300 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP328.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 20700 g NUP328 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "If the shaft must be located both ways, do not use NUP328 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NUP328 with a deep-groove ball bearing on rating alone: line contact gives 685 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 140 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 300×62 mm envelope matches.",
      "The 685/745 kN ratings, 72 kN Pu and 20700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP328 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP328?",
        "a": "NUP328 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 685 kN, C0 745 kN, Pu 72 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 20700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP328 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP328 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP328 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP328?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 260 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP328-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup328",
      "NUP328"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP328E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP328E",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 795,
    "fatigue_load_limit_kN": 76.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP328E denotes a 140×300×62 mm (5.512 × 11.811 × 2.441 in) cylindrical roller bearing in the NUP300 family, the high-capacity pressed-steel cage of the E execution. Digit by digit, NUP328E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 140 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 735 kN and C0 795 kN (C0/C ≈ 1.08) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Thermal planning around the 2,100 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,400 r/min for continuously high-duty 140 mm positions. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 140 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NUP328E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/795 kN pair here belongs to NUP328E as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NUP328E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 62 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP328E skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "The 735/795 kN ratings, 76.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP328E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP328E?",
        "a": "NUP328E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 62 mm width (5.512 × 11.811 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 795 kN, Pu 76.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP328E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP328E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP328E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP328E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm. The nominal bore/OD remain 140/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP328E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup328e",
      "NUP328E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4930",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4930",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 210,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 690,
    "fatigue_load_limit_kN": 70.5,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4930 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 380 kN dynamic rating in the 150 mm bore. Digit by digit, NN4930 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 380 kN and C0 690 kN (C0/C ≈ 1.82) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Equivalent-load planning treats NN4930 as a pure radial bearing: keep P below 380 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NN4930; an oversized radius locks the ring on its face and tilts the 60 mm-wide seat.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5900 g NN4930 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NN4930 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 150 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 210×60 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4930 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "The 380/690 kN ratings, 70.5 kN Pu and 5900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4930 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4930?",
        "a": "NN4930 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 210 mm OD and 60 mm width (5.906 × 8.268 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 690 kN, Pu 70.5 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5900 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4930 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4930 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4930?",
        "a": "NN4930 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4930?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 168.5 mm, Ew 196.5159 mm. The nominal bore/OD remain 150/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4930",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4930",
      "NN4930"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4930K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4930K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 210,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 690,
    "fatigue_load_limit_kN": 70.5,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4930K is the extra-light (10/49) section of the NTN NN4900 dimension series for a 150 mm shaft — 380 kN of basic dynamic capacity in a 5620 g, open bearing. Numbering ties NN4930K to its envelope: type code NN, series NN4900, 150 mm bore; the 210×60 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Speed ratio check: limiting 2,800 r/min is .85 of the 3,300 r/min oil value for NN4930K; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5620 g NN4930K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 30.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.",
      "The K tapered bore of NN4930K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 380/690 kN pair here belongs to NN4930K as printed, not to the bare size.",
      "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "The 380/690 kN ratings, 70.5 kN Pu and 5620 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4930K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4930K?",
        "a": "NN4930K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 210 mm OD and 60 mm width (5.906 × 8.268 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 690 kN, Pu 70.5 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5620 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4930K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4930K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4930K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4930K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4930 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4930K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 168.5 mm, Ew 196.5159 mm. The nominal bore/OD remain 150/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4930K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4930k",
      "NN4930K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4930K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4930K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 210,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 690,
    "fatigue_load_limit_kN": 70.5,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NNU4930K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,800 r/min on grease and 3,300 r/min on oil. On the NTN nameplate NNU states which ring carries the ribs, which determines whether NNU4930K floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. The 30.0 mm radial section ((210−150)/2) frames the roller complement; capacity per millimetre of bore is about 2.5 kN/mm before application factors. Equivalent-load planning treats NNU4930K as a pure radial bearing: keep P below 380 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 150 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5900 g NNU4930K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NNU4930K with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 210 mm race brinells and releases as vibration within hours.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 150 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 210×60 mm envelope matches.",
      "The 30.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.",
      "The 380/690 kN ratings, 70.5 kN Pu and 5900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4930K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4930K?",
        "a": "NNU4930K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 210 mm OD and 60 mm width (5.906 × 8.268 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 690 kN, Pu 70.5 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5900 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4930K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4930K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4930K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4930K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4930 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4930K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 168.5 mm, Ew 196.5159 mm. The nominal bore/OD remain 150/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4930K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4930k",
      "NNU4930K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1030",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1030",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 224,
    "static_load_kN": 294,
    "fatigue_load_limit_kN": 29.6,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3500,
    "weight_g": 4700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N1030 appears as a 150 mm bore single-row cylindrical roller bearing (224 kN C / 294 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). With C 224 kN and C0 294 kN (C0/C ≈ 1.31) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. The 150 mm (5.906 in) bore and 225 mm (8.858 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 35 mm-wide ring. Heat the inner ring to max 120 °C for the 150 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 3,500 r/min need positive flow and drain design; the 4700 g N1030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace N1030 with a deep-groove ball bearing on rating alone: line contact gives 224 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "Do not replace N1030 with a deep-groove ball bearing on rating alone: line contact gives 224 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1030 skids at 3,000 r/min and fails by smearing long before L10 fatigue.",
      "The 224/294 kN ratings, 29.6 kN Pu and 4700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1030?",
        "a": "N1030 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 35 mm width (5.906 × 8.858 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 224 kN, C0 294 kN, Pu 29.6 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 4700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1030 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1030 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1030 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1030?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169.5 mm, Ew 205.5 mm. The nominal bore/OD remain 150/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1030",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1030",
      "N1030"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1030",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1030",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 224,
    "static_load_kN": 294,
    "fatigue_load_limit_kN": 29.6,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3500,
    "weight_g": 4700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1030 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 224 kN dynamic rating in the 150 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1030 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. The 37.5 mm radial section ((225−150)/2) frames the roller complement; capacity per millimetre of bore is about 1.5 kN/mm before application factors. Mass 4700 g for the 150×225×35 mm NJ1030 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 3,500 r/min need positive flow and drain design; the 4700 g NJ1030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 225 mm race brinells and releases as vibration within hours.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 225×35 mm envelope matches.",
      "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "The 37.5 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 35 mm-wide cavity.",
      "The 224/294 kN ratings, 29.6 kN Pu and 4700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1030?",
        "a": "NJ1030 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 35 mm width (5.906 × 8.858 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 224 kN, C0 294 kN, Pu 29.6 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 4700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1030 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1030 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1030 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1030?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169.5 mm, Ew 205.5 mm. The nominal bore/OD remain 150/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1030",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1030",
      "NJ1030"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3030",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3030",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 370,
    "static_load_kN": 585,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 7810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN3030 on the 150×225 mm envelope, 56 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 2,600 r/min. Numbering ties NN3030 to its envelope: type code NN, series NN3000, 150 mm bore; the 225×56 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 370 kN and C0 585 kN (C0/C ≈ 1.58) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 2,600 r/min is .84 of the 3,100 r/min oil value for NN3030; grease-churn heating closes that gap as fill quantity rises. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7810 g NN3030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3030 skids at 2,600 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NN3030 with a deep-groove ball bearing on rating alone: line contact gives 370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 150 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 225×56 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3030 skids at 2,600 r/min and fails by smearing long before L10 fatigue.",
      "The 370/585 kN ratings, 59 kN Pu and 7810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3030?",
        "a": "NN3030 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 585 kN, Pu 59 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 7810 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3030 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3030 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3030?",
        "a": "NN3030 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3030?",
        "a": "NTN rates NN3030 at 2,600 r/min with grease and 3,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3030",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3030",
      "NN3030"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3030K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3030K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 370,
    "static_load_kN": 585,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 7530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3030K appears as a 150 mm bore single-row cylindrical roller bearing (370 kN C / 585 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). The roller-set pitch sits inside the 37.5 mm radial section between the 150 mm bore and 225 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Mass 7530 g for the 150×225×56 mm NN3030K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 7530 g NN3030K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NN3030K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 150 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 225×56 mm envelope matches.",
      "The 370/585 kN ratings, 59 kN Pu and 7530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3030K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3030K?",
        "a": "NN3030K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 370 kN, C0 585 kN, Pu 59 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 7530 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3030K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3030K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3030K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3030K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3030 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3030K?",
        "a": "NTN rates NN3030K at 2,600 r/min with grease and 3,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3030K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3030k",
      "NN3030K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1030",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1030",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 224,
    "static_load_kN": 294,
    "fatigue_load_limit_kN": 29.6,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3500,
    "weight_g": 4700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU1030 on the 150×225 mm envelope, 35 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,000 r/min. Numbering ties NU1030 to its envelope: type code NU, series NU1000, 150 mm bore; the 225×35 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 3,500 r/min with oil versus 3,000 r/min with grease (a 500 r/min band), lubrication choice for NU1030 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 3,500 r/min need positive flow and drain design; the 4700 g NU1030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 224/294 kN pair here belongs to NU1030 as printed, not to the bare size.",
      "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "The 35 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "Grease limiting speed 3,000 r/min and oil 3,500 r/min are different limits for NU1030: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 224/294 kN ratings, 29.6 kN Pu and 4700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1030?",
        "a": "NU1030 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 35 mm width (5.906 × 8.858 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 224 kN, C0 294 kN, Pu 29.6 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 4700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1030 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1030 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1030 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1030?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169.5 mm, Ew 205.5 mm. The nominal bore/OD remain 150/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1030-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1030",
      "NU1030"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1030",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1030",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 224,
    "static_load_kN": 294,
    "fatigue_load_limit_kN": 29.6,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3500,
    "weight_g": 4700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP1030 on the 150×225 mm envelope, 35 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,000 r/min. Numbering ties NUP1030 to its envelope: type code NUP, series NUP1000, 150 mm bore; the 225×35 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 224 kN and C0 294 kN (C0/C ≈ 1.31) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Selection arithmetic: Pu 29.6 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.31 (294/224 kN) shows the high-static-capacity proportioning of this 150 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1030.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 3,500 r/min need positive flow and drain design; the 4700 g NUP1030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 224/294 kN pair here belongs to NUP1030 as printed, not to the bare size.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 225×35 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 224/294 kN pair here belongs to NUP1030 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1030 skids at 3,000 r/min and fails by smearing long before L10 fatigue.",
      "The 224/294 kN ratings, 29.6 kN Pu and 4700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1030 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1030?",
        "a": "NUP1030 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 35 mm width (5.906 × 8.858 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 224 kN, C0 294 kN, Pu 29.6 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 4700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1030 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1030 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1030 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1030?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169.5 mm, Ew 205.5 mm. The nominal bore/OD remain 150/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1030",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1030",
      "NUP1030"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2230",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2230",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 710,
    "fatigue_load_limit_kN": 69.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2230 is the wide (22) section of the NTN N2200 dimension series for a 150 mm shaft — 555 kN of basic dynamic capacity in a 16000 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 270 mm OD and 73 mm width from the ISO 15 general plan. The 73 mm width and 60.0 mm section put the N2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 150 mm (5.906 in) bore and 270 mm (10.63 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 73 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g N2230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 270×73 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 555/710 kN pair here belongs to N2230 as printed, not to the bare size.",
      "Open N2230 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.",
      "The 555/710 kN ratings, 69.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2230?",
        "a": "N2230 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 710 kN, Pu 69.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2230 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2230 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2230 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2230?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2230",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2230",
      "N2230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N230",
    "brand": "NTN",
    "manufacturer_designation": "NTN N230",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 435,
    "fatigue_load_limit_kN": 42.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 9720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N230 on the 150×270 mm envelope, 45 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,500 r/min. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 182 mm and Ew 238 mm — the envelope inside the 150/270 mm bore/OD where the rollers actually run. Equivalent-load planning treats N230 as a pure radial bearing: keep P below 380 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g N230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N230 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The N rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 270×45 mm envelope matches.",
      "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N230?",
        "a": "N230 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N230 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N230 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N230 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N230?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N230",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n230",
      "N230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF230",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF230",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 435,
    "fatigue_load_limit_kN": 42.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 9720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NF230 denotes a 150×270×45 mm (5.906 × 10.63 × 1.772 in) cylindrical roller bearing in the NF200 family, a pressed sheet-steel cage. Numbering ties NF230 to its envelope: type code NF, series NF200, 150 mm bore; the 270×45 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,900 r/min with oil versus 2,500 r/min with grease (a 400 r/min band), lubrication choice for NF230 is a thermal decision, not just a sealing one. Rating life at 380 kN C assumes clean oil and adequate film; the 42.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 150 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g NF230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NF230 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.",
      "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NF230 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NF230: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF230?",
        "a": "NF230 is an NTN NF single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF230 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF230 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF230 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF230?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF230",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf230",
      "NF230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2230",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2230",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 710,
    "fatigue_load_limit_kN": 69.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2230 appears as a 150 mm bore single-row cylindrical roller bearing (555 kN C / 710 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NJ2230 to its envelope: type code NJ, series NJ2200, 150 mm bore; the 270×73 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 182 mm and Ew 238 mm — the envelope inside the 150/270 mm bore/OD where the rollers actually run. The 3.7 kN-per-mm-bore figure (555 kN over 150 mm) lets a NJ2230 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2230 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g NJ2230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 555/710 kN pair here belongs to NJ2230 as printed, not to the bare size.",
      "Do not replace NJ2230 with a deep-groove ball bearing on rating alone: line contact gives 555 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 73 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×73 mm envelope matches.",
      "The 555/710 kN ratings, 69.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2230?",
        "a": "NJ2230 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 710 kN, Pu 69.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2230 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2230 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2230 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2230?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2230-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2230",
      "NJ2230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2230E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2230E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 980,
    "fatigue_load_limit_kN": 95.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2230E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 735 kN dynamic rating in the 150 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2230E floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 2,000 r/min is .83 of the 2,400 r/min oil value for NJ2230E; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NJ2230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×73 mm envelope matches.",
      "The 73 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×73 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/980 kN pair here belongs to NJ2230E as printed, not to the bare size.",
      "The 735/980 kN ratings, 95.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2230E?",
        "a": "NJ2230E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 980 kN, Pu 95.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2230E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2230E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2230E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2230E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2230E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2230e",
      "NJ2230E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ230",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ230",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 435,
    "fatigue_load_limit_kN": 42.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 9720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NJ230: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 2,500 r/min on grease and 2,900 r/min on oil. Numbering ties NJ230 to its envelope: type code NJ, series NJ200, 150 mm bore; the 270×45 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 182 mm and Ew 238 mm — the envelope inside the 150/270 mm bore/OD where the rollers actually run. Equivalent-load planning treats NJ230 as a pure radial bearing: keep P below 380 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ230 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g NJ230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.",
      "Open NJ230 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×45 mm envelope matches.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×45 mm envelope matches.",
      "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ230?",
        "a": "NJ230 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ230 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ230 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ230 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ230?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ230-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj230",
      "NJ230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ230E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ230E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 495,
    "static_load_kN": 595,
    "fatigue_load_limit_kN": 58,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ230E appears as a 150 mm bore single-row cylindrical roller bearing (495 kN C / 595 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ230E floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 182 mm — the envelope inside the 150/270 mm bore/OD where the rollers actually run. Equivalent-load planning treats NJ230E as a pure radial bearing: keep P below 495 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ230E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NJ230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ230E skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.",
      "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 270×45 mm envelope matches.",
      "The 495/595 kN ratings, 58 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ230E?",
        "a": "NJ230E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 595 kN, Pu 58 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ230E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ230E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ230E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ230E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ230E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj230e",
      "NJ230E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2230",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2230",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 710,
    "fatigue_load_limit_kN": 69.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NU2230: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2230 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NU2230 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 16000 g for the 150×270×73 mm NU2230 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g NU2230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NU2230 with a deep-groove ball bearing on rating alone: line contact gives 555 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 555/710 kN ratings, 69.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2230?",
        "a": "NU2230 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 710 kN, Pu 69.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2230 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2230 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2230 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2230?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2230-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2230",
      "NU2230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2230E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2230E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 980,
    "fatigue_load_limit_kN": 95.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2230E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 150×270×73 mm ISO 15 envelope. Numbering ties NU2230E to its envelope: type code NU, series NU2200, 150 mm bore; the 270×73 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 60.0 mm radial section ((270−150)/2) frames the roller complement; capacity per millimetre of bore is about 4.9 kN/mm before application factors. Rating life at 735 kN C assumes clean oil and adequate film; the 95.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NU2230E; an oversized radius locks the ring on its face and tilts the 73 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NU2230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2230E skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NU2230E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 73 mm-wide cavity.",
      "The 735/980 kN ratings, 95.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2230E?",
        "a": "NU2230E is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 980 kN, Pu 95.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2230E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2230E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2230E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2230E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2230E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2230e",
      "NU2230E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU230",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU230",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 435,
    "fatigue_load_limit_kN": 42.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 9720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU230 is the standard section of the NTN NU200 dimension series for a 150 mm shaft — 380 kN of basic dynamic capacity in a 9720 g, open bearing. Digit by digit, NU230 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,500 r/min grease and 2,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 150 mm bore. Speed ratio check: limiting 2,500 r/min is .86 of the 2,900 r/min oil value for NU230; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU230 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g NU230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.",
      "Open NU230 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use NU230 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU230?",
        "a": "NU230 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU230 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU230 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU230 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU230?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU230-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu230",
      "NU230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU230E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU230E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 495,
    "static_load_kN": 595,
    "fatigue_load_limit_kN": 58,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NU230E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. Digit by digit, NU230E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NU230E designation when purchasing. Equivalent-load planning treats NU230E as a pure radial bearing: keep P below 495 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NU230E; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NU230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 495/595 kN pair here belongs to NU230E as printed, not to the bare size.",
      "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NU230E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.",
      "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "The 495/595 kN ratings, 58 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU230E?",
        "a": "NU230E is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 595 kN, Pu 58 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU230E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU230E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU230E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU230E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU230E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu230e",
      "NU230E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2230",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2230",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 710,
    "fatigue_load_limit_kN": 69.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2230 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 555 kN dynamic rating in the 150 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2230 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. With C 555 kN and C0 710 kN (C0/C ≈ 1.28) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. Rating life at 555 kN C assumes clean oil and adequate film; the 69.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 150 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g NUP2230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NUP2230: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2230 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The 555/710 kN ratings, 69.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2230?",
        "a": "NUP2230 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 710 kN, Pu 69.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2230 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2230 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2230 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2230?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2230",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2230",
      "NUP2230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2230E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2230E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 980,
    "fatigue_load_limit_kN": 95.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2230E is the wide (22) section of the NTN NUP2200 dimension series for a 150 mm shaft — 735 kN of basic dynamic capacity in a open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 270 mm OD and 73 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass Dimensions 150×270×73 mm and the 735 kN C rating define the substitution envelope; check the 2203E mass column for this exact NUP2230E execution. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NUP2230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 73 mm-wide cavity.",
      "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NUP2230E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/980 kN pair here belongs to NUP2230E as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/980 kN pair here belongs to NUP2230E as printed, not to the bare size.",
      "The 735/980 kN ratings, 95.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2230E?",
        "a": "NUP2230E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 980 kN, Pu 95.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2230E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2230E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2230E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2230E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2230E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2230e",
      "NUP2230E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP230",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP230",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 435,
    "fatigue_load_limit_kN": 42.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 9720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP230 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 150×270×45 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 270 mm OD and 45 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP230. Rating life at 380 kN C assumes clean oil and adequate film; the 42.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 9720 g NUP230 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 60.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 45 mm-wide cavity.",
      "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 380/435 kN pair here belongs to NUP230 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.",
      "The 380/435 kN ratings, 42.5 kN Pu and 9720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP230 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP230?",
        "a": "NUP230 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 435 kN, Pu 42.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 9720 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP230 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP230 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP230 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP230?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm, Ew 238 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP230-ECJ",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup230",
      "NUP230"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP230E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP230E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 495,
    "static_load_kN": 595,
    "fatigue_load_limit_kN": 58,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP230E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 495 kN dynamic rating in the 150 mm bore. Digit by digit, NUP230E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 3.3 kN-per-mm-bore figure (495 kN over 150 mm) lets a NUP230E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NUP230E; an oversized radius locks the ring on its face and tilts the 45 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the NUP230E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 495/595 kN pair here belongs to NUP230E as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 270 mm race brinells and releases as vibration within hours.",
      "The 45 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 495/595 kN pair here belongs to NUP230E as printed, not to the bare size.",
      "The 495/595 kN ratings, 58 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP230E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP230E?",
        "a": "NUP230E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 45 mm width (5.906 × 10.63 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 495 kN, C0 595 kN, Pu 58 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP230E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP230E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP230E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP230E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 182 mm. The nominal bore/OD remain 150/270 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP230E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup230e",
      "NUP230E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2330",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2330",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 39800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N2330 denotes a 150×320×108 mm (5.906 × 12.598 × 4.252 in) cylindrical roller bearing in the N2300 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N2330 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N2330. Thermal planning around the 1,900 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,200 r/min for continuously high-duty 150 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 150 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 39800 g N2330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for N2330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The N rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "The 1130/1400 kN ratings, 132 kN Pu and 39800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2330?",
        "a": "N2330 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1400 kN, Pu 132 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 39800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2330 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2330 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2330 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2330?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2330",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2330",
      "N2330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N330",
    "brand": "NTN",
    "manufacturer_designation": "NTN N330",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 805,
    "fatigue_load_limit_kN": 76,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2500,
    "weight_g": 24700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies N330: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 2,100 r/min on grease and 2,500 r/min on oil. Digit by digit, N330 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 2,500 r/min with oil versus 2,100 r/min with grease (a 400 r/min band), lubrication choice for N330 is a thermal decision, not just a sealing one. The 150 mm (5.906 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 65 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N330 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g N330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "If the shaft must be located both ways, do not use N330 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 2,100 r/min and oil 2,500 r/min are different limits for N330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N330?",
        "a": "N330 is an NTN N single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N330 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N330 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N330 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N330?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N330",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n330",
      "N330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF330",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF330",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 805,
    "fatigue_load_limit_kN": 76,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2500,
    "weight_g": 24700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF330 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 150×320×65 mm ISO 15 envelope. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 320 mm OD and 65 mm width from the ISO 15 general plan. The 85.0 mm radial section ((320−150)/2) frames the roller complement; capacity per millimetre of bore is about 4.9 kN/mm before application factors. Thermal planning around the 2,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,500 r/min for continuously high-duty 150 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF330.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g NF330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NF330 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 150 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 320×65 mm envelope matches.",
      "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF330?",
        "a": "NF330 is an NTN NF single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF330 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF330 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF330 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF330?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF330",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf330",
      "NF330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2330",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2330",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 39800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2330 is the extra-wide (23) section of the NTN NJ2300 dimension series for a 150 mm shaft — 1130 kN of basic dynamic capacity in a 39800 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 320 mm OD and 108 mm width from the ISO 15 general plan. At 2,200 r/min with oil versus 1,900 r/min with grease (a 300 r/min band), lubrication choice for NJ2330 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 39800 g NJ2330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NJ2330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2330 skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NJ2330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1130/1400 kN ratings, 132 kN Pu and 39800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2330?",
        "a": "NJ2330 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1400 kN, Pu 132 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 39800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2330 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2330 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2330 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2330?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2330-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×320×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2330",
      "NJ2330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2330E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2330E",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1290,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 150,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NJ2330E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,700 r/min on grease and 2,000 r/min on oil. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 320 mm OD and 108 mm width from the ISO 15 general plan. At 2,000 r/min with oil versus 1,700 r/min with grease (a 300 r/min band), lubrication choice for NJ2330E is a thermal decision, not just a sealing one. The 150 mm (5.906 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 108 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2330E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NJ2330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ2330E with a deep-groove ball bearing on rating alone: line contact gives 1290 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NJ2330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NJ2330E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1290/1600 kN ratings, 150 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2330E?",
        "a": "NJ2330E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1290 kN, C0 1600 kN, Pu 150 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2330E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2330E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2330E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2330E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2330E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2330e",
      "NJ2330E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ330",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ330",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 805,
    "fatigue_load_limit_kN": 76,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2500,
    "weight_g": 24700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ330 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 735 kN dynamic rating in the 150 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ330 floats or locates; the numeric remainder is the ISO 15 series and 150 mm bore reference, not a fit or clearance instruction. The 85.0 mm radial section ((320−150)/2) frames the roller complement; capacity per millimetre of bore is about 4.9 kN/mm before application factors. Selection arithmetic: Pu 76 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.10 (805/735 kN) shows the high-static-capacity proportioning of this 150 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ330 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g NJ330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/805 kN pair here belongs to NJ330 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ330 skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NJ330 with a deep-groove ball bearing on rating alone: line contact gives 735 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ330?",
        "a": "NJ330 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ330 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ330 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ330 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ330?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ330-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×320×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj330",
      "NJ330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ330E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ330E",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 840,
    "static_load_kN": 920,
    "fatigue_load_limit_kN": 86.5,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ330E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 840 kN dynamic rating in the 150 mm bore. Numbering ties NJ330E to its envelope: type code NJ, series NJ300, 150 mm bore; the 320×65 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 840 kN and C0 920 kN (C0/C ≈ 1.10) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 150 mm (5.906 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 65 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ330E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NJ330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ330E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ330E skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "The 840/920 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ330E?",
        "a": "NJ330E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 840 kN, C0 920 kN, Pu 86.5 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ330E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ330E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ330E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ330E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ330E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj330e",
      "NJ330E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2330",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2330",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 39800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2330 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1130 kN dynamic rating in the 150 mm bore. Digit by digit, NU2330 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 193 mm and Ew 277 mm — the envelope inside the 150/320 mm bore/OD where the rollers actually run. Equivalent-load planning treats NU2330 as a pure radial bearing: keep P below 1130 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 39800 g NU2330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 150 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2330 skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 150 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.",
      "The 1130/1400 kN ratings, 132 kN Pu and 39800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2330?",
        "a": "NU2330 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1400 kN, Pu 132 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 39800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2330 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2330 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2330 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2330?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2330-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×320×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2330",
      "NU2330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2330E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2330E",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1290,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 150,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2330E denotes a 150×320×108 mm (5.906 × 12.598 × 4.252 in) cylindrical roller bearing in the NU2300 family, the high-capacity pressed-steel cage of the E execution. Digit by digit, NU2330E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Selection arithmetic: Pu 150 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.24 (1600/1290 kN) shows the high-static-capacity proportioning of this 150 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NU2330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU2330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NU2330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NU2330E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1290/1600 kN pair here belongs to NU2330E as printed, not to the bare size.",
      "The 1290/1600 kN ratings, 150 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2330E?",
        "a": "NU2330E is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1290 kN, C0 1600 kN, Pu 150 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2330E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2330E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2330E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2330E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2330E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2330e",
      "NU2330E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU330",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU330",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 805,
    "fatigue_load_limit_kN": 76,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2500,
    "weight_g": 24700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU330 denotes a 150×320×65 mm (5.906 × 12.598 × 2.559 in) cylindrical roller bearing in the NU300 family, a pressed sheet-steel cage. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 150 mm, with 320 mm OD and 65 mm width from the ISO 15 general plan. With C 735 kN and C0 805 kN (C0/C ≈ 1.10) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Thermal planning around the 2,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,500 r/min for continuously high-duty 150 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU330 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g NU330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/805 kN pair here belongs to NU330 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU330 skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU330 skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU330 skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU330?",
        "a": "NU330 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU330 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU330 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU330 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU330?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU330-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 150×320×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu330",
      "NU330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU330E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU330E",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 840,
    "static_load_kN": 920,
    "fatigue_load_limit_kN": 86.5,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU330E on the 150×320 mm envelope, 65 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,900 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,900 r/min grease and 2,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 150 mm bore. Rating life at 840 kN C assumes clean oil and adequate film; the 86.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 150 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NU330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NU330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU330E skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NU330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 840/920 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU330E?",
        "a": "NU330E is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 840 kN, C0 920 kN, Pu 86.5 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU330E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU330E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU330E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU330E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU330E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu330e",
      "NU330E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2330",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2330",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 39800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2330 appears as a 150 mm bore single-row cylindrical roller bearing (1130 kN C / 1400 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NUP2330 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 150 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 39800 g for the 150×320×108 mm NUP2330 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 150 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 39800 g NUP2330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 150 mm inner ring.",
      "If the shaft must be located both ways, do not use NUP2330 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NUP2330: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1130/1400 kN pair here belongs to NUP2330 as printed, not to the bare size.",
      "The 1130/1400 kN ratings, 132 kN Pu and 39800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2330?",
        "a": "NUP2330 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1400 kN, Pu 132 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 39800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2330 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2330 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2330 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2330?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2330",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2330",
      "NUP2330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2330E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2330E",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1290,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 150,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2330E appears as a 150 mm bore single-row cylindrical roller bearing (1290 kN C / 1600 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NUP2330E to its envelope: type code NUP, series NUP2300, 150 mm bore; the 320×108 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,000 r/min with oil versus 1,700 r/min with grease (a 300 r/min band), lubrication choice for NUP2330E is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2330E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NUP2330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP2330E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 150 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 320×108 mm envelope matches.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NUP2330E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1290/1600 kN ratings, 150 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2330E?",
        "a": "NUP2330E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1290 kN, C0 1600 kN, Pu 150 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2330E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2330E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2330E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2330E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2330E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2330e",
      "NUP2330E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP330",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP330",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 735,
    "static_load_kN": 805,
    "fatigue_load_limit_kN": 76,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2500,
    "weight_g": 24700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP330 on the 150×320 mm envelope, 65 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,100 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 4.9 kN-per-mm-bore figure (735 kN over 150 mm) lets a NUP330 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 24700 g NUP330 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP330 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 85.0 mm section at 150 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 735/805 kN pair here belongs to NUP330 as printed, not to the bare size.",
      "The 735/805 kN ratings, 76 kN Pu and 24700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP330 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP330?",
        "a": "NUP330 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 735 kN, C0 805 kN, Pu 76 kN, grease limiting speed 2,100 r/min, oil 2,500 r/min, mass about 24700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP330 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP330 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP330 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP330?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 277 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP330",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup330",
      "NUP330"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP330E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP330E",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 840,
    "static_load_kN": 920,
    "fatigue_load_limit_kN": 86.5,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 150 mm shaft NTN supplies NUP330E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,900 r/min on grease and 2,300 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 150 mm (00–03 use the 10/12/15/17 exception table). At 2,300 r/min with oil versus 1,900 r/min with grease (a 400 r/min band), lubrication choice for NUP330E is a thermal decision, not just a sealing one. Speed ratio check: limiting 1,900 r/min is .83 of the 2,300 r/min oil value for NUP330E; grease-churn heating closes that gap as fill quantity rises. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 150 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 150 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NUP330E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 150 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NUP330E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 150 mm contact.",
      "Grease limiting speed 1,900 r/min and oil 2,300 r/min are different limits for NUP330E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 840/920 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP330E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP330E?",
        "a": "NUP330E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 65 mm width (5.906 × 12.598 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 840 kN, C0 920 kN, Pu 86.5 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP330E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP330E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP330E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP330E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 150/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP330E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup330e",
      "NUP330E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4932",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4932",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 395,
    "static_load_kN": 740,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 6240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN4932 appears as a 160 mm bore single-row cylindrical roller bearing (395 kN C / 740 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NN4932 to its envelope: type code NN, series NN4900, 160 mm bore; the 220×60 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 178.5 mm and Ew 206.5169 mm — the envelope inside the 160/220 mm bore/OD where the rollers actually run. Mass 6240 g for the 160×220×60 mm NN4932 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 6240 g NN4932 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 160 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 220×60 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 220 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 395/740 kN pair here belongs to NN4932 as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 160 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 220×60 mm envelope matches.",
      "The 395/740 kN ratings, 74 kN Pu and 6240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4932 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4932?",
        "a": "NN4932 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 60 mm width (6.299 × 8.661 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 740 kN, Pu 74 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 6240 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4932 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4932 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4932?",
        "a": "NN4932 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4932?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 178.5 mm, Ew 206.5169 mm. The nominal bore/OD remain 160/220 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4932",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4932",
      "NN4932"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4932K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4932K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 395,
    "static_load_kN": 740,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 5940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN4932K on the 160×220 mm envelope, 60 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 2,600 r/min. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4932K floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NN4932K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 160 mm (6.299 in) bore and 220 mm (8.661 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 60 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 5940 g NN4932K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN4932K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NN4932K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 160 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 220×60 mm envelope matches.",
      "Do not replace NN4932K with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 395/740 kN ratings, 74 kN Pu and 5940 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4932K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4932K?",
        "a": "NN4932K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 60 mm width (6.299 × 8.661 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 740 kN, Pu 74 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 5940 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4932K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4932K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4932K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4932K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4932 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4932K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 178.5 mm, Ew 206.5169 mm. The nominal bore/OD remain 160/220 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4932K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4932k",
      "NN4932K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4932K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4932K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 395,
    "static_load_kN": 740,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 6230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4932K is the extra-light (10/49) section of the NTN NNU4900 dimension series for a 160 mm shaft — 395 kN of basic dynamic capacity in a 6230 g, open bearing. Digit by digit, NNU4932K reads as NNU (double row, ribbed outer ring, separable inner), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 3,100 r/min with oil versus 2,600 r/min with grease (a 500 r/min band), lubrication choice for NNU4932K is a thermal decision, not just a sealing one. Rating life at 395 kN C assumes clean oil and adequate film; the 74 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NNU4932K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 6230 g NNU4932K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 30.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.",
      "The K tapered bore of NNU4932K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NNU4932K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 395/740 kN ratings, 74 kN Pu and 6230 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4932K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4932K?",
        "a": "NNU4932K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 60 mm width (6.299 × 8.661 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 740 kN, Pu 74 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 6230 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4932K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4932K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4932K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4932K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4932 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4932K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 178.5 mm, Ew 206.5169 mm. The nominal bore/OD remain 160/220 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4932K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4932k",
      "NNU4932K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1032",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1032",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 263,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 34,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1032 is the extra-light (10/49) section of the NTN N1000 dimension series for a 160 mm shaft — 263 kN of basic dynamic capacity in a 5810 g, open bearing. Digit by digit, N1032 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 180 mm and Ew 220 mm — the envelope inside the 160/240 mm bore/OD where the rollers actually run. The 1.6 kN-per-mm-bore figure (263 kN over 160 mm) lets a N1032 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5810 g N1032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,800 r/min and oil 3,300 r/min are different limits for N1032: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.",
      "The N rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 240×38 mm envelope matches.",
      "The 263/340 kN ratings, 34 kN Pu and 5810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1032?",
        "a": "N1032 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 38 mm width (6.299 × 9.449 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 340 kN, Pu 34 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5810 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1032 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1032 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1032?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 220 mm. The nominal bore/OD remain 160/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1032",
      "N1032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1032",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1032",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 263,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 34,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ1032 appears as a 160 mm bore single-row cylindrical roller bearing (263 kN C / 340 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 160 mm (6.299 in) bore and 240 mm (9.449 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 38 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 160 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5810 g NJ1032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 263/340 kN pair here belongs to NJ1032 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 263/340 kN pair here belongs to NJ1032 as printed, not to the bare size.",
      "The 263/340 kN ratings, 34 kN Pu and 5810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1032?",
        "a": "NJ1032 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 38 mm width (6.299 × 9.449 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 340 kN, Pu 34 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5810 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1032 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1032 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1032?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 220 mm. The nominal bore/OD remain 160/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1032",
      "NJ1032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3032",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3032",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 415,
    "static_load_kN": 660,
    "fatigue_load_limit_kN": 65.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 8920,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NN3032: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,500 r/min on grease and 2,900 r/min on oil. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 240 mm OD and 60 mm width from the ISO 15 general plan. The roller-set pitch sits inside the 40.0 mm radial section between the 160 mm bore and 240 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Selection arithmetic: Pu 65.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.59 (660/415 kN) shows the high-static-capacity proportioning of this 160 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3032.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 8920 g NN3032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN3032 with a deep-groove ball bearing on rating alone: line contact gives 415 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 415/660 kN pair here belongs to NN3032 as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 160 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 240×60 mm envelope matches.",
      "The 415/660 kN ratings, 65.5 kN Pu and 8920 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3032?",
        "a": "NN3032 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 415 kN, C0 660 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 8920 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3032 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3032?",
        "a": "NN3032 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3032?",
        "a": "NTN rates NN3032 at 2,500 r/min with grease and 2,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3032",
      "NN3032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3032K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3032K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 415,
    "static_load_kN": 660,
    "fatigue_load_limit_kN": 65.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 8590,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3032K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 160×240×60 mm ISO 15 envelope. Numbering ties NN3032K to its envelope: type code NN, series NN3000, 160 mm bore; the 240×60 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 8590 g NN3032K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN3032K with a deep-groove ball bearing on rating alone: line contact gives 415 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.",
      "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 415/660 kN ratings, 65.5 kN Pu and 8590 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3032K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3032K?",
        "a": "NN3032K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 415 kN, C0 660 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 8590 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3032K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3032K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3032K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3032K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3032 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3032K?",
        "a": "NTN rates NN3032K at 2,500 r/min with grease and 2,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3032K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3032k",
      "NN3032K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1032",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1032",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 263,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 34,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NU1032: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,800 r/min on grease and 3,300 r/min on oil. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 240 mm OD and 38 mm width from the ISO 15 general plan. With C 263 kN and C0 340 kN (C0/C ≈ 1.29) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Thermal planning around the 2,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,300 r/min for continuously high-duty 160 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1032.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5810 g NU1032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 38 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "The 263/340 kN ratings, 34 kN Pu and 5810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1032?",
        "a": "NU1032 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 38 mm width (6.299 × 9.449 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 340 kN, Pu 34 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5810 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1032 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1032 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1032?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 220 mm. The nominal bore/OD remain 160/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1032-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1032",
      "NU1032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1032",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1032",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 263,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 34,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NUP1032: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,800 r/min on grease and 3,300 r/min on oil. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 240 mm OD and 38 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 180 mm and Ew 220 mm — the envelope inside the 160/240 mm bore/OD where the rollers actually run. Equivalent-load planning treats NUP1032 as a pure radial bearing: keep P below 263 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP1032; an oversized radius locks the ring on its face and tilts the 38 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5810 g NUP1032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 38 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 263/340 kN pair here belongs to NUP1032 as printed, not to the bare size.",
      "Open NUP1032 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 240×38 mm envelope matches.",
      "The 263/340 kN ratings, 34 kN Pu and 5810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1032?",
        "a": "NUP1032 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 38 mm width (6.299 × 9.449 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 340 kN, Pu 34 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5810 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1032 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1032 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1032?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 220 mm. The nominal bore/OD remain 160/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1032",
      "NUP1032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2232",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2232",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 700,
    "static_load_kN": 940,
    "fatigue_load_limit_kN": 90,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N2232 denotes a 160×290×80 mm (6.299 × 11.417 × 3.15 in) cylindrical roller bearing in the N2200 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N2232 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2232 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 4.4 kN-per-mm-bore figure (700 kN over 160 mm) lets a N2232 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 160 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 21600 g N2232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open N2232 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "If the shaft must be located both ways, do not use N2232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open N2232 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 700/940 kN ratings, 90 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2232?",
        "a": "N2232 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 700 kN, C0 940 kN, Pu 90 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 21600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2232 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2232 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2232",
      "N2232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N232",
    "brand": "NTN",
    "manufacturer_designation": "NTN N232",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies N232: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 2,300 r/min on grease and 2,700 r/min on oil. Digit by digit, N232 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N232. Mass 13400 g for the 160×290×48 mm N232 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 160 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g N232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 475/570 kN pair here belongs to N232 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N232 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use N232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N232?",
        "a": "N232 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N232 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N232 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n232",
      "N232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF232",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF232 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 160×290×48 mm ISO 15 envelope. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 48 mm width from the ISO 15 general plan. With C 475 kN and C0 570 kN (C0/C ≈ 1.20) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g NF232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF232 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NF232 with a deep-groove ball bearing on rating alone: line contact gives 475 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 160 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 290×48 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF232 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF232?",
        "a": "NF232 is an NTN NF single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF232 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF232 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf232",
      "NF232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2232",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 700,
    "static_load_kN": 940,
    "fatigue_load_limit_kN": 90,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2232 is the wide (22) section of the NTN NJ2200 dimension series for a 160 mm shaft — 700 kN of basic dynamic capacity in a 21600 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 80 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2232. Rating life at 700 kN C assumes clean oil and adequate film; the 90 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 21600 g NJ2232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2232 skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 700/940 kN ratings, 90 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2232?",
        "a": "NJ2232 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 700 kN, C0 940 kN, Pu 90 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 21600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2232 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2232 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2232-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2232",
      "NJ2232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2232E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 895,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 114,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ2232E denotes a 160×290×80 mm (6.299 × 11.417 × 3.15 in) cylindrical roller bearing in the NJ2200 family, the high-capacity pressed-steel cage of the E execution. Digit by digit, NJ2232E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 895 kN and C0 1190 kN (C0/C ≈ 1.33) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 160 mm (6.299 in) bore and 290 mm (11.417 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NJ2232E; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NJ2232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NJ2232E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 895/1190 kN pair here belongs to NJ2232E as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NJ2232E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2232E skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "The 895/1190 kN ratings, 114 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2232E?",
        "a": "NJ2232E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 895 kN, C0 1190 kN, Pu 114 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2232E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2232E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2232e",
      "NJ2232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ232",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ232 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 475 kN dynamic rating in the 160 mm bore. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 48 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ232. Mass 13400 g for the 160×290×48 mm NJ232 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g NJ232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 475/570 kN pair here belongs to NJ232 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ232?",
        "a": "NJ232 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ232 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ232 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ232-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj232",
      "NJ232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ232E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ232E is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 160×290×48 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NJ232E designation when purchasing. Equivalent-load planning treats NJ232E as a pure radial bearing: keep P below 555 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 160 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NJ232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ232E skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ232E skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 555/665 kN ratings, 63.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ232E?",
        "a": "NJ232E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 665 kN, Pu 63.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ232E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ232E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj232e",
      "NJ232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2232",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 700,
    "static_load_kN": 940,
    "fatigue_load_limit_kN": 90,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2232 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 700 kN dynamic rating in the 160 mm bore. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). The 80 mm width and 65.0 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 160 mm (6.299 in) bore and 290 mm (11.417 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2232 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 21600 g NU2232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 160 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 290×80 mm envelope matches.",
      "If the shaft must be located both ways, do not use NU2232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NU2232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NU2232 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "The 700/940 kN ratings, 90 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2232?",
        "a": "NU2232 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 700 kN, C0 940 kN, Pu 90 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 21600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2232 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2232 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2232-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2232",
      "NU2232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2232E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 895,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 114,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2232E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 895 kN dynamic rating in the 160 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2232E floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. At 2,200 r/min with oil versus 1,900 r/min with grease (a 300 r/min band), lubrication choice for NU2232E is a thermal decision, not just a sealing one. Selection arithmetic: Pu 114 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.33 (1190/895 kN) shows the high-static-capacity proportioning of this 160 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2232E.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NU2232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 895/1190 kN pair here belongs to NU2232E as printed, not to the bare size.",
      "Do not replace NU2232E with a deep-groove ball bearing on rating alone: line contact gives 895 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NU2232E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NU2232E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 895/1190 kN ratings, 114 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2232E?",
        "a": "NU2232E is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 895 kN, C0 1190 kN, Pu 114 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2232E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2232E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2232e",
      "NU2232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU232",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU232 denotes a 160×290×48 mm (6.299 × 11.417 × 1.89 in) cylindrical roller bearing in the NU200 family, a pressed sheet-steel cage. Numbering ties NU232 to its envelope: type code NU, series NU200, 160 mm bore; the 290×48 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NU232 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 54.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.20 (570/475 kN) shows the high-static-capacity proportioning of this 160 mm bore. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g NU232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "If the shaft must be located both ways, do not use NU232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NU232 with a deep-groove ball bearing on rating alone: line contact gives 475 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU232?",
        "a": "NU232 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU232 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU232 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU232-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu232",
      "NU232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU232E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU232E is the standard section of the NTN NU200 dimension series for a 160 mm shaft — 555 kN of basic dynamic capacity in a open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 48 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU232E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 555 kN C assumes clean oil and adequate film; the 63.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU232E.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NU232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NU232E with a deep-groove ball bearing on rating alone: line contact gives 555 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU232E skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NU232E with a deep-groove ball bearing on rating alone: line contact gives 555 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 555/665 kN ratings, 63.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU232E?",
        "a": "NU232E is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 665 kN, Pu 63.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU232E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU232E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu232e",
      "NU232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2232",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 700,
    "static_load_kN": 940,
    "fatigue_load_limit_kN": 90,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2232 appears as a 160 mm bore single-row cylindrical roller bearing (700 kN C / 940 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 195 mm and Ew 255 mm — the envelope inside the 160/290 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2232 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 21600 g NUP2232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 290×80 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 2,100 r/min and oil 2,400 r/min are different limits for NUP2232: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 290×80 mm envelope matches.",
      "The 700/940 kN ratings, 90 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2232?",
        "a": "NUP2232 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 700 kN, C0 940 kN, Pu 90 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 21600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2232 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2232 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2232",
      "NUP2232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2232E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 895,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 114,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2232E on the 160×290 mm envelope, 80 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,900 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). With C 895 kN and C0 1190 kN (C0/C ≈ 1.33) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Housing and shaft fillets must clear the ring chamfers of NUP2232E; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NUP2232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2232E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "Do not replace NUP2232E with a deep-groove ball bearing on rating alone: line contact gives 895 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 290×80 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2232E skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "The 895/1190 kN ratings, 114 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2232E?",
        "a": "NUP2232E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 895 kN, C0 1190 kN, Pu 114 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2232E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2232E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2232e",
      "NUP2232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP232",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP232 on the 160×290 mm envelope, 48 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,300 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP232 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP232 designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP232.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g NUP232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP232 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Open NUP232 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP232?",
        "a": "NUP232 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP232 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP232 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP232-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup232",
      "NUP232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP232E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP232E denotes a 160×290×48 mm (6.299 × 11.417 × 1.89 in) cylindrical roller bearing in the NUP200 family, the high-capacity pressed-steel cage of the E execution. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 48 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP232E. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NUP232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 65.0 mm section at 160 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 48 mm-wide cavity.",
      "Grease limiting speed 2,100 r/min and oil 2,400 r/min are different limits for NUP232E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 555/665 kN ratings, 63.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP232E?",
        "a": "NUP232E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 665 kN, Pu 63.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP232E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP232E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup232e",
      "NUP232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2332",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2332",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1520,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2332 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 160×340×114 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N2332 designation when purchasing. Speed ratio check: limiting 1,700 r/min is .85 of the 2,000 r/min oil value for N2332; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 160 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 49500 g N2332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N2332 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1190/1520 kN pair here belongs to N2332 as printed, not to the bare size.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for N2332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 114 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 1190/1520 kN ratings, 141 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2332?",
        "a": "N2332 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1520 kN, Pu 141 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 49500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2332 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2332 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2332",
      "N2332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N332",
    "brand": "NTN",
    "manufacturer_designation": "NTN N332",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N332 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 775 kN dynamic rating in the 160 mm bore. Numbering ties N332 to its envelope: type code N, series N300, 160 mm bore; the 340×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 775 kN and C0 875 kN (C0/C ≈ 1.13) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. The 4.8 kN-per-mm-bore figure (775 kN over 160 mm) lets a N332 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g N332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace N332 with a deep-groove ball bearing on rating alone: line contact gives 775 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The N rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×68 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N332 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N332?",
        "a": "N332 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N332 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N332 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n332",
      "N332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF332",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NF332 on the 160×340 mm envelope, 68 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,000 r/min. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF332 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 2,000 r/min is .87 of the 2,300 r/min oil value for NF332; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NF332; an oversized radius locks the ring on its face and tilts the 68 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g NF332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NF332 as printed, not to the bare size.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NF332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NF332 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NF332 as printed, not to the bare size.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF332?",
        "a": "NF332 is an NTN NF single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF332 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF332 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf332",
      "NF332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2332",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1520,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ2332 denotes a 160×340×114 mm (6.299 × 13.386 × 4.488 in) cylindrical roller bearing in the NJ2300 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2332 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. With C 1190 kN and C0 1520 kN (C0/C ≈ 1.28) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Thermal planning around the 1,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,000 r/min for continuously high-duty 160 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2332.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 49500 g NJ2332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 340×114 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 114 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2332 skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "The 1190/1520 kN ratings, 141 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2332?",
        "a": "NJ2332 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1520 kN, Pu 141 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 49500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2332 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2332 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2332-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×114 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2332",
      "NJ2332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2332E",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 1820,
    "fatigue_load_limit_kN": 168,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2332E is the extra-wide (23) section of the NTN NJ2300 dimension series for a 160 mm shaft — 1460 kN of basic dynamic capacity in a open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 204 mm — the envelope inside the 160/340 mm bore/OD where the rollers actually run. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 1,900 r/min for continuously high-duty 160 mm positions. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 160 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NJ2332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 114 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 114 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 340×114 mm envelope matches.",
      "The 1460/1820 kN ratings, 168 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2332E?",
        "a": "NJ2332E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 1820 kN, Pu 168 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2332E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2332E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2332e",
      "NJ2332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ332",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ332 appears as a 160 mm bore single-row cylindrical roller bearing (775 kN C / 875 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NJ332 as a pure radial bearing: keep P below 775 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g NJ332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NJ332 as printed, not to the bare size.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ332?",
        "a": "NJ332 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ332 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ332 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ332-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj332",
      "NJ332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ332E",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 97.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ332E denotes a 160×340×68 mm (6.299 × 13.386 × 2.677 in) cylindrical roller bearing in the NJ300 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ332E floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ332E. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,100 r/min for continuously high-duty 160 mm positions. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 160 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NJ332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ332E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "Grease limiting speed 1,800 r/min and oil 2,100 r/min are different limits for NJ332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 950/1050 kN ratings, 97.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ332E?",
        "a": "NJ332E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1050 kN, Pu 97.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ332E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ332E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj332e",
      "NJ332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2332",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1520,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2332 appears as a 160 mm bore single-row cylindrical roller bearing (1190 kN C / 1520 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NU2332 to its envelope: type code NU, series NU2300, 160 mm bore; the 340×114 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2332. Mass 49500 g for the 160×340×114 mm NU2332 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2332 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 49500 g NU2332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 114 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1190/1520 kN pair here belongs to NU2332 as printed, not to the bare size.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 114 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 1190/1520 kN ratings, 141 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2332?",
        "a": "NU2332 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1520 kN, Pu 141 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 49500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2332 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2332 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2332-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×114 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2332",
      "NU2332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2332E",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 1820,
    "fatigue_load_limit_kN": 168,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NU2332E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,600 r/min on grease and 1,900 r/min on oil. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 340 mm OD and 114 mm width from the ISO 15 general plan. With C 1460 kN and C0 1820 kN (C0/C ≈ 1.25) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. The 9.1 kN-per-mm-bore figure (1460 kN over 160 mm) lets a NU2332E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NU2332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NU2332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2332E skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 1460/1820 kN ratings, 168 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2332E?",
        "a": "NU2332E is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 1820 kN, Pu 168 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2332E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2332E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2332e",
      "NU2332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU332",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU332 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 160×340×68 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU332 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 208 mm and Ew 292 mm — the envelope inside the 160/340 mm bore/OD where the rollers actually run. Speed ratio check: limiting 2,000 r/min is .87 of the 2,300 r/min oil value for NU332; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g NU332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 160 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×68 mm envelope matches.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU332?",
        "a": "NU332 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU332 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU332 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU332-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu332",
      "NU332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU332E",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 97.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU332E appears as a 160 mm bore single-row cylindrical roller bearing (950 kN C / 1050 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NU332E to its envelope: type code NU, series NU300, 160 mm bore; the 340×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 68 mm width and 90.0 mm section put the NU300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 97.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.11 (1050/950 kN) shows the high-static-capacity proportioning of this 160 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NU332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU332E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,800 r/min and oil 2,100 r/min are different limits for NU332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Open NU332E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "The 950/1050 kN ratings, 97.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU332E?",
        "a": "NU332E is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1050 kN, Pu 97.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU332E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU332E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu332e",
      "NU332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2332",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1520,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2332 is the extra-wide (23) section of the NTN NUP2300 dimension series for a 160 mm shaft — 1190 kN of basic dynamic capacity in a 49500 g, open bearing. Numbering ties NUP2332 to its envelope: type code NUP, series NUP2300, 160 mm bore; the 340×114 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,000 r/min with oil versus 1,700 r/min with grease (a 300 r/min band), lubrication choice for NUP2332 is a thermal decision, not just a sealing one. The 160 mm (6.299 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 114 mm-wide ring. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 49500 g NUP2332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 114 mm-wide cavity.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×114 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NUP2332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1190/1520 kN ratings, 141 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2332?",
        "a": "NUP2332 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1520 kN, Pu 141 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 49500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2332 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2332 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2332",
      "NUP2332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2332E",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 1820,
    "fatigue_load_limit_kN": 168,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2332E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 160×340×114 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2332E floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 204 mm — the envelope inside the 160/340 mm bore/OD where the rollers actually run. Equivalent-load planning treats NUP2332E as a pure radial bearing: keep P below 1460 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 160 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NUP2332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NUP2332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NUP2332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NUP2332E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×114 mm envelope matches.",
      "The 1460/1820 kN ratings, 168 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2332E?",
        "a": "NUP2332E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 1820 kN, Pu 168 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2332E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2332E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2332e",
      "NUP2332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP332",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NUP332: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,000 r/min on grease and 2,300 r/min on oil. Digit by digit, NUP332 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 2,300 r/min with oil versus 2,000 r/min with grease (a 300 r/min band), lubrication choice for NUP332 is a thermal decision, not just a sealing one. Rating life at 775 kN C assumes clean oil and adequate film; the 81 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP332.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g NUP332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NUP332 as printed, not to the bare size.",
      "Do not replace NUP332 with a deep-groove ball bearing on rating alone: line contact gives 775 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NUP332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NUP332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP332?",
        "a": "NUP332 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP332 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP332 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup332",
      "NUP332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP332E",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 97.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP332E is the standard section of the NTN NUP300 dimension series for a 160 mm shaft — 950 kN of basic dynamic capacity in a open bearing. Numbering ties NUP332E to its envelope: type code NUP, series NUP300, 160 mm bore; the 340×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 204 mm — the envelope inside the 160/340 mm bore/OD where the rollers actually run. The 160 mm (6.299 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 68 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NUP332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP332E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 950/1050 kN pair here belongs to NUP332E as printed, not to the bare size.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×68 mm envelope matches.",
      "The 950/1050 kN ratings, 97.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP332E?",
        "a": "NUP332E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1050 kN, Pu 97.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP332E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP332E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup332e",
      "NUP332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4934",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4934",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 400,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 75.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 6560,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4934 is the extra-light (10/49) section of the NTN NN4900 dimension series for a 170 mm shaft — 400 kN of basic dynamic capacity in a 6560 g, open bearing. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 230 mm OD and 60 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN4934. The 170 mm (6.693 in) bore and 230 mm (9.055 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 60 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 170 mm shaft.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 6560 g NN4934 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN4934 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NN4934: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NN4934 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "The 400/765 kN ratings, 75.5 kN Pu and 6560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4934 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4934?",
        "a": "NN4934 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 60 mm width (6.693 × 9.055 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 400 kN, C0 765 kN, Pu 75.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 6560 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4934 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4934 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4934?",
        "a": "NN4934 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4934?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 188.5 mm, Ew 216.5179 mm. The nominal bore/OD remain 170/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4934",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4934",
      "NN4934"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4934K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4934K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 400,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 75.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 6240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN4934K appears as a 170 mm bore single-row cylindrical roller bearing (400 kN C / 765 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Digit by digit, NN4934K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NN4934K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 2,500 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 2,900 r/min for continuously high-duty 170 mm positions. Housing and shaft fillets must clear the ring chamfers of NN4934K; an oversized radius locks the ring on its face and tilts the 60 mm-wide seat.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 6240 g NN4934K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The K tapered bore of NN4934K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Do not replace NN4934K with a deep-groove ball bearing on rating alone: line contact gives 400 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The K tapered bore of NN4934K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 400/765 kN ratings, 75.5 kN Pu and 6240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4934K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4934K?",
        "a": "NN4934K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 60 mm width (6.693 × 9.055 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 400 kN, C0 765 kN, Pu 75.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 6240 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4934K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4934K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4934K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4934K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4934 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4934K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 188.5 mm, Ew 216.5179 mm. The nominal bore/OD remain 170/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4934K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4934k",
      "NN4934K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4934K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4934K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 400,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 75.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 6550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NNU4934K on the 170×230 mm envelope, 60 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 2,500 r/min. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 230 mm OD and 60 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 188.5 mm and Ew 216.5179 mm — the envelope inside the 170/230 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 75.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.91 (765/400 kN) shows the high-static-capacity proportioning of this 170 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 170 mm shaft.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 6550 g NNU4934K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 230×60 mm envelope matches.",
      "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 230×60 mm envelope matches.",
      "The 400/765 kN ratings, 75.5 kN Pu and 6550 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4934K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4934K?",
        "a": "NNU4934K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 60 mm width (6.693 × 9.055 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 400 kN, C0 765 kN, Pu 75.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 6550 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4934K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4934K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4934K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4934K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4934 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4934K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 188.5 mm, Ew 216.5179 mm. The nominal bore/OD remain 170/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4934K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4934k",
      "NNU4934K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1034",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1034",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 310,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 38.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3000,
    "weight_g": 7760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N1034 denotes a 170×260×42 mm (6.693 × 10.236 × 1.654 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. Numbering ties N1034 to its envelope: type code N, series N1000, 170 mm bore; the 260×42 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N1034. Rating life at 310 kN C assumes clean oil and adequate film; the 38.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N1034.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the 7760 g N1034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N1034 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "Grease limiting speed 2,600 r/min and oil 3,000 r/min are different limits for N1034: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The 310/400 kN ratings, 38.5 kN Pu and 7760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1034?",
        "a": "N1034 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 42 mm width (6.693 × 10.236 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 400 kN, Pu 38.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min, mass about 7760 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1034 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1034 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1034?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 237 mm. The nominal bore/OD remain 170/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1034",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1034",
      "N1034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1034",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1034",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 310,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 38.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3000,
    "weight_g": 7760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1034 is the extra-light (10/49) section of the NTN NJ1000 dimension series for a 170 mm shaft — 310 kN of basic dynamic capacity in a 7760 g, open bearing. Digit by digit, NJ1034 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 3,000 r/min with oil versus 2,600 r/min with grease (a 400 r/min band), lubrication choice for NJ1034 is a thermal decision, not just a sealing one. The 1.8 kN-per-mm-bore figure (310 kN over 170 mm) lets a NJ1034 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ1034 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the 7760 g NJ1034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 260×42 mm envelope matches.",
      "Open NJ1034 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "Grease limiting speed 2,600 r/min and oil 3,000 r/min are different limits for NJ1034: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 310/400 kN ratings, 38.5 kN Pu and 7760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1034?",
        "a": "NJ1034 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 42 mm width (6.693 × 10.236 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 400 kN, Pu 38.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min, mass about 7760 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1034 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1034 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1034?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 237 mm. The nominal bore/OD remain 170/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1034-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1034",
      "NJ1034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3034",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3034",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 490,
    "static_load_kN": 775,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3034 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 490 kN dynamic rating in the 170 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3034 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3034. Equivalent-load planning treats NN3034 as a pure radial bearing: keep P below 490 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NN3034; an oversized radius locks the ring on its face and tilts the 67 mm-wide seat.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 12600 g NN3034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NN3034: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NN3034: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NN3034 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The 490/775 kN ratings, 75 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3034?",
        "a": "NN3034 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 490 kN, C0 775 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 12600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3034 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3034?",
        "a": "NN3034 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3034?",
        "a": "NTN rates NN3034 at 2,300 r/min with grease and 2,700 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3034",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3034",
      "NN3034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3034K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3034K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 490,
    "static_load_kN": 775,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 12200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3034K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 490 kN dynamic rating in the 170 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3034K floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NN3034K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NN3034K as a pure radial bearing: keep P below 490 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3034K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 12200 g NN3034K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 67 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 67 mm-wide cavity.",
      "Do not replace NN3034K with a deep-groove ball bearing on rating alone: line contact gives 490 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NN3034K with a deep-groove ball bearing on rating alone: line contact gives 490 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 490/775 kN ratings, 75 kN Pu and 12200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3034K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3034K?",
        "a": "NN3034K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 490 kN, C0 775 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 12200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3034K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3034K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3034K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3034K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3034 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3034K?",
        "a": "NTN rates NN3034K at 2,300 r/min with grease and 2,700 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3034K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3034k",
      "NN3034K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1034",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1034",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 310,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 38.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3000,
    "weight_g": 7760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1034 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 310 kN dynamic rating in the 170 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1034 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 193 mm and Ew 237 mm — the envelope inside the 170/260 mm bore/OD where the rollers actually run. Speed ratio check: limiting 2,600 r/min is .87 of the 3,000 r/min oil value for NU1034; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NU1034; an oversized radius locks the ring on its face and tilts the 42 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the 7760 g NU1034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 260×42 mm envelope matches.",
      "The 310/400 kN ratings, 38.5 kN Pu and 7760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1034?",
        "a": "NU1034 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 42 mm width (6.693 × 10.236 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 400 kN, Pu 38.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min, mass about 7760 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1034 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1034 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1034?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 237 mm. The nominal bore/OD remain 170/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1034-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1034",
      "NU1034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1034",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1034",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 310,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 38.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3000,
    "weight_g": 7760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1034 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 310 kN dynamic rating in the 170 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1034 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP1034. Mass 7760 g for the 170×260×42 mm NUP1034 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 170 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the 7760 g NUP1034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "Open NUP1034 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The 42 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The 310/400 kN ratings, 38.5 kN Pu and 7760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1034?",
        "a": "NUP1034 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 42 mm width (6.693 × 10.236 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 400 kN, Pu 38.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min, mass about 7760 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1034 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1034 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1034?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 237 mm. The nominal bore/OD remain 170/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1034",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1034",
      "NUP1034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2234",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2234",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 795,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2234 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 170×310×86 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). The 70.0 mm radial section ((310−170)/2) frames the roller complement; capacity per millimetre of bore is about 4.7 kN/mm before application factors. Rating life at 795 kN C assumes clean oil and adequate film; the 101 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2234 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 26700 g N2234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2234 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The N rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×86 mm envelope matches.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "The 795/1080 kN ratings, 101 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2234?",
        "a": "N2234 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 795 kN, C0 1080 kN, Pu 101 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 26700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2234 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2234 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2234",
      "N2234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N234",
    "brand": "NTN",
    "manufacturer_designation": "NTN N234",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N234 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 530 kN dynamic rating in the 170 mm bore. Numbering ties N234 to its envelope: type code N, series N200, 170 mm bore; the 310×52 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N234 designation when purchasing. The 170 mm (6.693 in) bore and 310 mm (12.205 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 52 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N234 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g N234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "The N rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N234?",
        "a": "N234 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N234 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N234 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n234",
      "N234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF234",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NF234 on the 170×310 mm envelope, 52 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,200 r/min. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF234 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 208 mm and Ew 272 mm — the envelope inside the 170/310 mm bore/OD where the rollers actually run. Thermal planning around the 2,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,500 r/min for continuously high-duty 170 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF234.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g NF234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NF234 with a deep-groove ball bearing on rating alone: line contact gives 530 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 530/635 kN pair here belongs to NF234 as printed, not to the bare size.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 170 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF234?",
        "a": "NF234 is an NTN NF single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF234 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF234 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf234",
      "NF234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2234",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 795,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ2234 denotes a 170×310×86 mm (6.693 × 12.205 × 3.386 in) cylindrical roller bearing in the NJ2200 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2234 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ2234 designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 26700 g NJ2234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NJ2234: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 795/1080 kN ratings, 101 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2234?",
        "a": "NJ2234 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 795 kN, C0 1080 kN, Pu 101 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 26700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2234 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2234 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2234-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2234",
      "NJ2234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2234E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1070,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 170 mm shaft NTN supplies NJ2234E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,800 r/min on grease and 2,100 r/min on oil. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 310 mm OD and 86 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2234E. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,100 r/min for continuously high-duty 170 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2234E.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NJ2234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NJ2234E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The 1070/1410 kN ratings, 132 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2234E?",
        "a": "NJ2234E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1070 kN, C0 1410 kN, Pu 132 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2234E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2234E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2234e",
      "NJ2234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ234",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ234 appears as a 170 mm bore single-row cylindrical roller bearing (530 kN C / 635 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ234 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ234 designation when purchasing. The 170 mm (6.693 in) bore and 310 mm (12.205 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 52 mm-wide ring. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g NJ234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ234 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "Open NJ234 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ234?",
        "a": "NJ234 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ234 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ234 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ234-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj234",
      "NJ234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ234E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 670,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ234E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 670 kN dynamic rating in the 170 mm bore. Numbering ties NJ234E to its envelope: type code NJ, series NJ200, 170 mm bore; the 310×52 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NJ234E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 670 kN C assumes clean oil and adequate film; the 75 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 170 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NJ234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/800 kN pair here belongs to NJ234E as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/800 kN pair here belongs to NJ234E as printed, not to the bare size.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Do not replace NJ234E with a deep-groove ball bearing on rating alone: line contact gives 670 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 670/800 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ234E?",
        "a": "NJ234E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 800 kN, Pu 75 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ234E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ234E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 207 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj234e",
      "NJ234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2234",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 795,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2234 appears as a 170 mm bore single-row cylindrical roller bearing (795 kN C / 1080 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NU2234 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NU2234 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 4.7 kN-per-mm-bore figure (795 kN over 170 mm) lets a NU2234 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 170 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 26700 g NU2234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU2234 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×86 mm envelope matches.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×86 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 795/1080 kN ratings, 101 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2234?",
        "a": "NU2234 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 795 kN, C0 1080 kN, Pu 101 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 26700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2234 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2234 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2234-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2234",
      "NU2234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2234E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1070,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2234E denotes a 170×310×86 mm (6.693 × 12.205 × 3.386 in) cylindrical roller bearing in the NU2200 family, the high-capacity pressed-steel cage of the E execution. Digit by digit, NU2234E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 205 mm — the envelope inside the 170/310 mm bore/OD where the rollers actually run. The 6.3 kN-per-mm-bore figure (1070 kN over 170 mm) lets a NU2234E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NU2234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2234E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×86 mm envelope matches.",
      "The 1070/1410 kN ratings, 132 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2234E?",
        "a": "NU2234E is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1070 kN, C0 1410 kN, Pu 132 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2234E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2234E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2234e",
      "NU2234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU234",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU234 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 170×310×52 mm ISO 15 envelope. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 310 mm OD and 52 mm width from the ISO 15 general plan. The 52 mm width and 70.0 mm section put the NU200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NU234 as a pure radial bearing: keep P below 530 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g NU234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU234 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "Open NU234 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU234?",
        "a": "NU234 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU234 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU234 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU234-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu234",
      "NU234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU234E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 670,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU234E on the 170×310 mm envelope, 52 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,000 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NU234E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 75 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.19 (800/670 kN) shows the high-static-capacity proportioning of this 170 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NU234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU234E with a deep-groove ball bearing on rating alone: line contact gives 670 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU234E skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 670/800 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU234E?",
        "a": "NU234E is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 800 kN, Pu 75 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU234E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU234E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 207 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu234e",
      "NU234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2234",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 795,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2234 is the wide (22) section of the NTN NUP2200 dimension series for a 170 mm shaft — 795 kN of basic dynamic capacity in a 26700 g, open bearing. Digit by digit, NUP2234 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2234. Thermal planning around the 2,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,300 r/min for continuously high-duty 170 mm positions. Heat the inner ring to max 120 °C for the 170 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 26700 g NUP2234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2234 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "If the shaft must be located both ways, do not use NUP2234 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The 795/1080 kN ratings, 101 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2234?",
        "a": "NUP2234 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 795 kN, C0 1080 kN, Pu 101 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 26700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2234 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2234 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2234",
      "NUP2234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2234E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1070,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2234E appears as a 170 mm bore single-row cylindrical roller bearing (1070 kN C / 1410 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NUP2234E to its envelope: type code NUP, series NUP2200, 170 mm bore; the 310×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2234E. Equivalent-load planning treats NUP2234E as a pure radial bearing: keep P below 1070 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2234E.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NUP2234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP2234E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2234E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NUP2234E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The 1070/1410 kN ratings, 132 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2234E?",
        "a": "NUP2234E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1070 kN, C0 1410 kN, Pu 132 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2234E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2234E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2234e",
      "NUP2234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP234",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 170 mm shaft NTN supplies NUP234: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,200 r/min on grease and 2,500 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,200 r/min grease and 2,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 170 mm bore. Thermal planning around the 2,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,500 r/min for continuously high-duty 170 mm positions. Housing and shaft fillets must clear the ring chamfers of NUP234; an oversized radius locks the ring on its face and tilts the 52 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g NUP234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "If the shaft must be located both ways, do not use NUP234 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP234?",
        "a": "NUP234 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP234 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP234 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup234",
      "NUP234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP234E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 670,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 170 mm shaft NTN supplies NUP234E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,000 r/min on grease and 2,300 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,000 r/min grease and 2,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 170 mm bore. Equivalent-load planning treats NUP234E as a pure radial bearing: keep P below 670 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP234E; an oversized radius locks the ring on its face and tilts the 52 mm-wide seat.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NUP234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP234E with a deep-groove ball bearing on rating alone: line contact gives 670 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NUP234E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 670/800 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP234E?",
        "a": "NUP234E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 800 kN, Pu 75 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP234E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP234E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 207 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup234e",
      "NUP234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2334",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2334",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 58300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N2334 on the 170×360 mm envelope, 120 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,600 r/min. Digit by digit, N2334 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 170 mm bore. Selection arithmetic: Pu 159 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.29 (1750/1360 kN) shows the high-static-capacity proportioning of this 170 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2334 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 58300 g N2334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1360/1750 kN pair here belongs to N2334 as printed, not to the bare size.",
      "Open N2334 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use N2334 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1360/1750 kN ratings, 159 kN Pu and 58300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2334?",
        "a": "N2334 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1750 kN, Pu 159 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 58300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2334 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2334 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2334",
      "N2334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N334",
    "brand": "NTN",
    "manufacturer_designation": "NTN N334",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N334 appears as a 170 mm bore single-row cylindrical roller bearing (885 kN C / 1010 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 360 mm OD and 72 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 220 mm and Ew 310 mm — the envelope inside the 170/360 mm bore/OD where the rollers actually run. Rating life at 885 kN C assumes clean oil and adequate film; the 92 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g N334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 360×72 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 885/1010 kN pair here belongs to N334 as printed, not to the bare size.",
      "The N rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 360×72 mm envelope matches.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N334?",
        "a": "N334 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N334 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N334 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n334",
      "N334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF334",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 170 mm shaft NTN supplies NF334: one integral rib on each ring; the open execution is rated 1,800 r/min on grease and 2,200 r/min on oil. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). At 2,200 r/min with oil versus 1,800 r/min with grease (a 400 r/min band), lubrication choice for NF334 is a thermal decision, not just a sealing one. Selection arithmetic: Pu 92 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.14 (1010/885 kN) shows the high-static-capacity proportioning of this 170 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 170 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g NF334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 72 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NF334 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Grease limiting speed 1,800 r/min and oil 2,200 r/min are different limits for NF334: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF334?",
        "a": "NF334 is an NTN NF single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF334 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF334 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf334",
      "NF334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2334",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 58300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2334 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 170×360×120 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 220 mm and Ew 310 mm — the envelope inside the 170/360 mm bore/OD where the rollers actually run. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for NJ2334; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ2334; an oversized radius locks the ring on its face and tilts the 120 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 58300 g NJ2334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2334 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "If the shaft must be located both ways, do not use NJ2334 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NJ2334 with a deep-groove ball bearing on rating alone: line contact gives 1360 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 360×120 mm envelope matches.",
      "The 1360/1750 kN ratings, 159 kN Pu and 58300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2334?",
        "a": "NJ2334 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1750 kN, Pu 159 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 58300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2334 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2334 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2334-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×360×120 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2334",
      "NJ2334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ334",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ334 is the standard section of the NTN NJ300 dimension series for a 170 mm shaft — 885 kN of basic dynamic capacity in a 36100 g, open bearing. Digit by digit, NJ334 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 2,200 r/min with oil versus 1,800 r/min with grease (a 400 r/min band), lubrication choice for NJ334 is a thermal decision, not just a sealing one. Mass 36100 g for the 170×360×72 mm NJ334 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g NJ334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 95.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 72 mm-wide cavity.",
      "Do not replace NJ334 with a deep-groove ball bearing on rating alone: line contact gives 885 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,800 r/min and oil 2,200 r/min are different limits for NJ334: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,800 r/min and oil 2,200 r/min are different limits for NJ334: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ334?",
        "a": "NJ334 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ334 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ334 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj334",
      "NJ334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2334",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 58300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2334 is the extra-wide (23) section of the NTN NU2300 dimension series for a 170 mm shaft — 1360 kN of basic dynamic capacity in a 58300 g, open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 360 mm OD and 120 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU2334 designation when purchasing. The 170 mm (6.693 in) bore and 360 mm (14.173 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 120 mm-wide ring. Heat the inner ring to max 120 °C for the 170 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 58300 g NU2334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "Open NU2334 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Do not replace NU2334 with a deep-groove ball bearing on rating alone: line contact gives 1360 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 120 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 1360/1750 kN ratings, 159 kN Pu and 58300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2334?",
        "a": "NU2334 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1750 kN, Pu 159 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 58300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2334 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2334 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2334-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×360×120 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2334",
      "NU2334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU334",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU334 on the 170×360 mm envelope, 72 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,800 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU334. Selection arithmetic: Pu 92 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.14 (1010/885 kN) shows the high-static-capacity proportioning of this 170 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g NU334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 95.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 72 mm-wide cavity.",
      "Do not replace NU334 with a deep-groove ball bearing on rating alone: line contact gives 885 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NU334 with a deep-groove ball bearing on rating alone: line contact gives 885 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU334?",
        "a": "NU334 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU334 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU334 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU334-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×360×72 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu334",
      "NU334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2334",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 58300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2334 denotes a 170×360×120 mm (6.693 × 14.173 × 4.724 in) cylindrical roller bearing in the NUP2300 family, a pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 360 mm OD and 120 mm width from the ISO 15 general plan. With C 1360 kN and C0 1750 kN (C0/C ≈ 1.29) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 8.0 kN-per-mm-bore figure (1360 kN over 170 mm) lets a NUP2334 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2334.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 58300 g NUP2334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1360/1750 kN pair here belongs to NUP2334 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NUP2334 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2334 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 1360/1750 kN ratings, 159 kN Pu and 58300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2334?",
        "a": "NUP2334 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1750 kN, Pu 159 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 58300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2334 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2334 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2334",
      "NUP2334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP334",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP334 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 885 kN dynamic rating in the 170 mm bore. Numbering ties NUP334 to its envelope: type code NUP, series NUP300, 170 mm bore; the 360×72 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 885 kN and C0 1010 kN (C0/C ≈ 1.14) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Housing and shaft fillets must clear the ring chamfers of NUP334; an oversized radius locks the ring on its face and tilts the 72 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g NUP334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 72 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP334 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP334?",
        "a": "NUP334 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP334 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP334 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup334",
      "NUP334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4936",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4936",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 510,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 93,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 9450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN4936 denotes a 180×250×69 mm (7.087 × 9.843 × 2.717 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4936 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. The 2.8 kN-per-mm-bore figure (510 kN over 180 mm) lets a NN4936 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN4936 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 9450 g NN4936 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4936 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 69 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 69 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 510/965 kN ratings, 93 kN Pu and 9450 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4936 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4936?",
        "a": "NN4936 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 69 mm width (7.087 × 9.843 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 510 kN, C0 965 kN, Pu 93 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 9450 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4936 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4936 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4936?",
        "a": "NN4936 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4936?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 202 mm. The nominal bore/OD remain 180/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4936",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4936",
      "NN4936"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4936K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4936K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 510,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 93,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 9010,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4936K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 180×250×69 mm ISO 15 envelope. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 250 mm OD and 69 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 9010 g for the 180×250×69 mm NN4936K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN4936K.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 9010 g NN4936K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4936K skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 510/965 kN pair here belongs to NN4936K as printed, not to the bare size.",
      "The 510/965 kN ratings, 93 kN Pu and 9010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4936K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4936K?",
        "a": "NN4936K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 69 mm width (7.087 × 9.843 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 510 kN, C0 965 kN, Pu 93 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 9010 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4936K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4936K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4936K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4936K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4936 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4936K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 202 mm. The nominal bore/OD remain 180/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4936K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4936k",
      "NN4936K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4936K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4936K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 510,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 93,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 9460,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NNU4936K appears as a 180 mm bore single-row cylindrical roller bearing (510 kN C / 965 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). Double-row NNU precision cylindrical roller bearing: ribbed outer ring with a separable inner ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. The 2.8 kN-per-mm-bore figure (510 kN over 180 mm) lets a NNU4936K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 9460 g NNU4936K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NNU4936K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 510/965 kN pair here belongs to NNU4936K as printed, not to the bare size.",
      "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NNU4936K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 69 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 510/965 kN ratings, 93 kN Pu and 9460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4936K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4936K?",
        "a": "NNU4936K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 69 mm width (7.087 × 9.843 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 510 kN, C0 965 kN, Pu 93 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 9460 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4936K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4936K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4936K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4936K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4936 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4936K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 202 mm. The nominal bore/OD remain 180/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4936K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4936k",
      "NNU4936K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1036",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1036",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 485,
    "fatigue_load_limit_kN": 46.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2900,
    "weight_g": 10100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1036 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 180×280×46 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 280 mm OD and 46 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1036 designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Housing and shaft fillets must clear the ring chamfers of N1036; an oversized radius locks the ring on its face and tilts the 46 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 10100 g N1036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 380/485 kN pair here belongs to N1036 as printed, not to the bare size.",
      "Do not replace N1036 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 380/485 kN ratings, 46.5 kN Pu and 10100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1036?",
        "a": "N1036 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 46 mm width (7.087 × 11.024 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 485 kN, Pu 46.5 kN, grease limiting speed 2,400 r/min, oil 2,900 r/min, mass about 10100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1036 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1036 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1036?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm, Ew 255 mm. The nominal bore/OD remain 180/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1036",
      "N1036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1036",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1036",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 485,
    "fatigue_load_limit_kN": 46.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2900,
    "weight_g": 10100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ1036 denotes a 180×280×46 mm (7.087 × 11.024 × 1.811 in) cylindrical roller bearing in the NJ1000 family, a pressed sheet-steel cage. Numbering ties NJ1036 to its envelope: type code NJ, series NJ1000, 180 mm bore; the 280×46 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 380 kN and C0 485 kN (C0/C ≈ 1.28) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Rating life at 380 kN C assumes clean oil and adequate film; the 46.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 10100 g NJ1036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ1036 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Do not replace NJ1036 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1036 skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "The 380/485 kN ratings, 46.5 kN Pu and 10100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1036?",
        "a": "NJ1036 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 46 mm width (7.087 × 11.024 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 485 kN, Pu 46.5 kN, grease limiting speed 2,400 r/min, oil 2,900 r/min, mass about 10100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1036 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1036 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1036?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm, Ew 255 mm. The nominal bore/OD remain 180/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1036-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1036",
      "NJ1036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3036",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3036",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 630,
    "static_load_kN": 995,
    "fatigue_load_limit_kN": 94.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 16600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3036 appears as a 180 mm bore single-row cylindrical roller bearing (630 kN C / 995 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Mass 16600 g for the 180×280×74 mm NN3036 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16600 g NN3036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3036 does not substitute a precision-class execution.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 630/995 kN ratings, 94.5 kN Pu and 16600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3036?",
        "a": "NN3036 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 630 kN, C0 995 kN, Pu 94.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3036 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3036?",
        "a": "NN3036 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3036?",
        "a": "NTN rates NN3036 at 2,200 r/min with grease and 2,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3036",
      "NN3036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3036K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3036K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 630,
    "static_load_kN": 995,
    "fatigue_load_limit_kN": 94.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3036K denotes a 180×280×74 mm (7.087 × 11.024 × 2.913 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN3036K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NN3036K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 630 kN C assumes clean oil and adequate film; the 94.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 180 mm shaft.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g NN3036K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 180 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 280×74 mm envelope matches.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 50.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 74 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 630/995 kN ratings, 94.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3036K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3036K?",
        "a": "NN3036K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 630 kN, C0 995 kN, Pu 94.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3036K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3036K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3036K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3036K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3036 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3036K?",
        "a": "NTN rates NN3036K at 2,200 r/min with grease and 2,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3036K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3036k",
      "NN3036K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1036",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1036",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 485,
    "fatigue_load_limit_kN": 46.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2900,
    "weight_g": 10100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU1036 appears as a 180 mm bore single-row cylindrical roller bearing (380 kN C / 485 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1036. Selection arithmetic: Pu 46.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.28 (485/380 kN) shows the high-static-capacity proportioning of this 180 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 10100 g NU1036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.",
      "Do not replace NU1036 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NU1036 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.",
      "The 380/485 kN ratings, 46.5 kN Pu and 10100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1036?",
        "a": "NU1036 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 46 mm width (7.087 × 11.024 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 485 kN, Pu 46.5 kN, grease limiting speed 2,400 r/min, oil 2,900 r/min, mass about 10100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1036 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1036 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1036?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm, Ew 255 mm. The nominal bore/OD remain 180/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1036-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1036",
      "NU1036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1036",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1036",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 485,
    "fatigue_load_limit_kN": 46.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2900,
    "weight_g": 10100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP1036 appears as a 180 mm bore single-row cylindrical roller bearing (380 kN C / 485 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1036 designation when purchasing. The 180 mm (7.087 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 46 mm-wide ring. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 180 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 10100 g NUP1036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1036 skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 380/485 kN ratings, 46.5 kN Pu and 10100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1036?",
        "a": "NUP1036 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 46 mm width (7.087 × 11.024 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 485 kN, Pu 46.5 kN, grease limiting speed 2,400 r/min, oil 2,900 r/min, mass about 10100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1036 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1036 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1036?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm, Ew 255 mm. The nominal bore/OD remain 180/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1036",
      "NUP1036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2236",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2236",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 825,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 27800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N2236 on the 180×320 mm envelope, 86 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,800 r/min. Digit by digit, N2236 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 27800 g N2236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace N2236 with a deep-groove ball bearing on rating alone: line contact gives 825 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 825/1140 kN pair here belongs to N2236 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2236 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 825/1140 kN pair here belongs to N2236 as printed, not to the bare size.",
      "The 825/1140 kN ratings, 106 kN Pu and 27800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2236?",
        "a": "N2236 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 825 kN, C0 1140 kN, Pu 106 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 27800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2236 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2236 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2236",
      "N2236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N236",
    "brand": "NTN",
    "manufacturer_designation": "NTN N236",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N236 appears as a 180 mm bore single-row cylindrical roller bearing (550 kN C / 675 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 320 mm OD and 52 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 2,000 r/min grease and 2,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. The 3.1 kN-per-mm-bore figure (550 kN over 180 mm) lets a N236 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g N236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "Do not replace N236 with a deep-groove ball bearing on rating alone: line contact gives 550 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 550/675 kN pair here belongs to N236 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use N236 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N236?",
        "a": "N236 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N236 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N236 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n236",
      "N236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF236",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 180 mm shaft NTN supplies NF236: one integral rib on each ring; the open execution is rated 2,000 r/min on grease and 2,400 r/min on oil. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF236. Speed ratio check: limiting 2,000 r/min is .83 of the 2,400 r/min oil value for NF236; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NF236; an oversized radius locks the ring on its face and tilts the 52 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g NF236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NF236: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NF236: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NF236 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF236?",
        "a": "NF236 is an NTN NF single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF236 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF236 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf236",
      "NF236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2236",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 825,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 27800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2236 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 180×320×86 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,800 r/min grease and 2,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,200 r/min for continuously high-duty 180 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2236.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 27800 g NJ2236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NJ2236 with a deep-groove ball bearing on rating alone: line contact gives 825 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NJ2236 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 825/1140 kN ratings, 106 kN Pu and 27800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2236?",
        "a": "NJ2236 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 825 kN, C0 1140 kN, Pu 106 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 27800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2236 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2236 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2236-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2236",
      "NJ2236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2236E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1120,
    "static_load_kN": 1510,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2236E is the wide (22) section of the NTN NJ2200 dimension series for a 180 mm shaft — 1120 kN of basic dynamic capacity in a open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. Mass Dimensions 180×320×86 mm and the 1120 kN C rating define the substitution envelope; check the 2203E mass column for this exact NJ2236E execution. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NJ2236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NJ2236E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NJ2236E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NJ2236E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1120/1510 kN ratings, 139 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2236E?",
        "a": "NJ2236E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1120 kN, C0 1510 kN, Pu 139 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2236E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2236E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2236e",
      "NJ2236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ236",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ236 is the standard section of the NTN NJ200 dimension series for a 180 mm shaft — 550 kN of basic dynamic capacity in a 17300 g, open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,000 r/min grease and 2,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. The 3.1 kN-per-mm-bore figure (550 kN over 180 mm) lets a NJ236 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ236.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g NJ236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ236 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 70.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "If the shaft must be located both ways, do not use NJ236 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ236?",
        "a": "NJ236 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ236 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ236 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ236-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj236",
      "NJ236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ236E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 695,
    "static_load_kN": 850,
    "fatigue_load_limit_kN": 78.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ236E denotes a 180×320×52 mm (7.087 × 12.598 × 2.047 in) cylindrical roller bearing in the NJ200 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ236E floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NJ236E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 78.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.22 (850/695 kN) shows the high-static-capacity proportioning of this 180 mm bore. Housing and shaft fillets must clear the ring chamfers of NJ236E; an oversized radius locks the ring on its face and tilts the 52 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NJ236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use NJ236E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NJ236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 695/850 kN ratings, 78.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ236E?",
        "a": "NJ236E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 695 kN, C0 850 kN, Pu 78.5 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ236E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ236E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 217 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj236e",
      "NJ236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2236",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 825,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 27800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2236 is the wide (22) section of the NTN NU2200 dimension series for a 180 mm shaft — 825 kN of basic dynamic capacity in a 27800 g, open bearing. Numbering ties NU2236 to its envelope: type code NU, series NU2200, 180 mm bore; the 320×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 70.0 mm radial section ((320−180)/2) frames the roller complement; capacity per millimetre of bore is about 4.6 kN/mm before application factors. Rating life at 825 kN C assumes clean oil and adequate film; the 106 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 27800 g NU2236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2236 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 825/1140 kN pair here belongs to NU2236 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 825/1140 kN pair here belongs to NU2236 as printed, not to the bare size.",
      "The 70.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "The 825/1140 kN ratings, 106 kN Pu and 27800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2236?",
        "a": "NU2236 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 825 kN, C0 1140 kN, Pu 106 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 27800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2236 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2236 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2236-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2236",
      "NU2236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2236E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1120,
    "static_load_kN": 1510,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 180 mm shaft NTN supplies NU2236E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,600 r/min on grease and 1,900 r/min on oil. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 320 mm OD and 86 mm width from the ISO 15 general plan. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NU2236E designation when purchasing. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for NU2236E; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NU2236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU2236E with a deep-groove ball bearing on rating alone: line contact gives 1120 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU2236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Do not replace NU2236E with a deep-groove ball bearing on rating alone: line contact gives 1120 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 1120/1510 kN ratings, 139 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2236E?",
        "a": "NU2236E is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1120 kN, C0 1510 kN, Pu 139 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2236E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2236E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2236e",
      "NU2236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU236",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU236 on the 180×320 mm envelope, 52 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,000 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU236 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU236 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 17300 g for the 180×320×52 mm NU236 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU236.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g NU236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU236 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 70.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 550/675 kN pair here belongs to NU236 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU236?",
        "a": "NU236 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU236 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU236 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU236-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu236",
      "NU236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU236E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 695,
    "static_load_kN": 850,
    "fatigue_load_limit_kN": 78.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU236E appears as a 180 mm bore single-row cylindrical roller bearing (695 kN C / 850 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NU236E to its envelope: type code NU, series NU200, 180 mm bore; the 320×52 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. The 3.9 kN-per-mm-bore figure (695 kN over 180 mm) lets a NU236E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NU236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Open NU236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Open NU236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 695/850 kN pair here belongs to NU236E as printed, not to the bare size.",
      "The 695/850 kN ratings, 78.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU236E?",
        "a": "NU236E is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 695 kN, C0 850 kN, Pu 78.5 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU236E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU236E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 217 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu236e",
      "NU236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2236",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 825,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 27800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2236 denotes a 180×320×86 mm (7.087 × 12.598 × 3.386 in) cylindrical roller bearing in the NUP2200 family, a pressed sheet-steel cage. Numbering ties NUP2236 to its envelope: type code NUP, series NUP2200, 180 mm bore; the 320×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2236 designation when purchasing. Speed ratio check: limiting 1,800 r/min is .82 of the 2,200 r/min oil value for NUP2236; grease-churn heating closes that gap as fill quantity rises. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 27800 g NUP2236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2236 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 320×86 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP2236 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 825/1140 kN ratings, 106 kN Pu and 27800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2236?",
        "a": "NUP2236 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 825 kN, C0 1140 kN, Pu 106 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 27800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2236 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2236 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2236",
      "NUP2236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2236E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1120,
    "static_load_kN": 1510,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2236E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 180×320×86 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2236E floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. The 86 mm width and 70.0 mm section put the NUP2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 180 mm (7.087 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 86 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NUP2236E; an oversized radius locks the ring on its face and tilts the 86 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NUP2236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "Open NUP2236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2236E skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Open NUP2236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 1120/1510 kN ratings, 139 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2236E?",
        "a": "NUP2236E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1120 kN, C0 1510 kN, Pu 139 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2236E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2236E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2236e",
      "NUP2236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP236",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP236 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 550 kN dynamic rating in the 180 mm bore. Digit by digit, NUP236 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP236 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 2,000 r/min is .83 of the 2,400 r/min oil value for NUP236; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g NUP236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 320×52 mm envelope matches.",
      "Do not replace NUP236 with a deep-groove ball bearing on rating alone: line contact gives 550 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP236 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NUP236 with a deep-groove ball bearing on rating alone: line contact gives 550 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP236?",
        "a": "NUP236 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP236 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP236 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup236",
      "NUP236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP236E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 695,
    "static_load_kN": 850,
    "fatigue_load_limit_kN": 78.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP236E is the standard section of the NTN NUP200 dimension series for a 180 mm shaft — 695 kN of basic dynamic capacity in a open bearing. Numbering ties NUP236E to its envelope: type code NUP, series NUP200, 180 mm bore; the 320×52 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 52 mm width and 70.0 mm section put the NUP200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 695 kN C assumes clean oil and adequate film; the 78.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP236E.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NUP236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 695/850 kN pair here belongs to NUP236E as printed, not to the bare size.",
      "Do not replace NUP236E with a deep-groove ball bearing on rating alone: line contact gives 695 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NUP236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 695/850 kN ratings, 78.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP236E?",
        "a": "NUP236E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 695 kN, C0 850 kN, Pu 78.5 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP236E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP236E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 217 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup236e",
      "NUP236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2336",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2336",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 68100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 180 mm shaft NTN supplies N2336: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,500 r/min on grease and 1,800 r/min on oil. Numbering ties N2336 to its envelope: type code N, series N2300, 180 mm bore; the 380×126 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2336 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats N2336 as a pure radial bearing: keep P below 1530 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 68100 g N2336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 126 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 126 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "If the shaft must be located both ways, do not use N2336 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace N2336 with a deep-groove ball bearing on rating alone: line contact gives 1530 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1530/1990 kN ratings, 179 kN Pu and 68100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2336?",
        "a": "N2336 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 1990 kN, Pu 179 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 68100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2336 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2336 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2336",
      "N2336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N336",
    "brand": "NTN",
    "manufacturer_designation": "NTN N336",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N336 is the standard section of the NTN N300 dimension series for a 180 mm shaft — 1000 kN of basic dynamic capacity in a 43200 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N336 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N336. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N336.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g N336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open N336 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for N336: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open N336 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N336?",
        "a": "N336 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N336 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N336 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n336",
      "N336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF336",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF336 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1000 kN dynamic rating in the 180 mm bore. Digit by digit, NF336 reads as NF (one rib on each ring), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1000 kN and C0 1150 kN (C0/C ≈ 1.15) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Equivalent-load planning treats NF336 as a pure radial bearing: keep P below 1000 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 180 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g NF336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 100.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 75 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NF336 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 75 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF336 skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF336?",
        "a": "NF336 is an NTN NF single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF336 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF336 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf336",
      "NF336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2336",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 68100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ2336 on the 180×380 mm envelope, 126 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,500 r/min. Digit by digit, NJ2336 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2336. Selection arithmetic: Pu 179 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.30 (1990/1530 kN) shows the high-static-capacity proportioning of this 180 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 68100 g NJ2336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2336 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 380×126 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "The 1530/1990 kN ratings, 179 kN Pu and 68100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2336?",
        "a": "NJ2336 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 1990 kN, Pu 179 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 68100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2336 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2336 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2336-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×126 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2336",
      "NJ2336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ336",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ336 denotes a 180×380×75 mm (7.087 × 14.961 × 2.953 in) cylindrical roller bearing in the NJ300 family, a pressed sheet-steel cage. Numbering ties NJ336 to its envelope: type code NJ, series NJ300, 180 mm bore; the 380×75 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 1000 kN and C0 1150 kN (C0/C ≈ 1.15) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 180 mm (7.087 in) bore and 380 mm (14.961 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 75 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ336.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g NJ336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ336 skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ336?",
        "a": "NJ336 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ336 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ336 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ336-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×75 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj336",
      "NJ336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2336",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 68100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2336 denotes a 180×380×126 mm (7.087 × 14.961 × 4.961 in) cylindrical roller bearing in the NU2300 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2336 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 1,500 r/min grease and 1,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. The 8.5 kN-per-mm-bore figure (1530 kN over 180 mm) lets a NU2336 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 68100 g NU2336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 126 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NU2336 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1530/1990 kN ratings, 179 kN Pu and 68100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2336?",
        "a": "NU2336 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 1990 kN, Pu 179 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 68100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2336 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2336 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2336-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×126 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2336",
      "NU2336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU336",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 180 mm shaft NTN supplies NU336: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,700 r/min on grease and 2,000 r/min on oil. Digit by digit, NU336 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU336 designation when purchasing. Equivalent-load planning treats NU336 as a pure radial bearing: keep P below 1000 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU336.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g NU336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "The 75 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU336?",
        "a": "NU336 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU336 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU336 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU336-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×75 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu336",
      "NU336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2336",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 68100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2336 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 180×380×126 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2336 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 232 mm and Ew 328 mm — the envelope inside the 180/380 mm bore/OD where the rollers actually run. Rating life at 1530 kN C assumes clean oil and adequate film; the 179 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NUP2336; an oversized radius locks the ring on its face and tilts the 126 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 68100 g NUP2336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NUP2336 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 380×126 mm envelope matches.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 380×126 mm envelope matches.",
      "The 1530/1990 kN ratings, 179 kN Pu and 68100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2336?",
        "a": "NUP2336 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 1990 kN, Pu 179 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 68100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2336 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2336 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2336",
      "NUP2336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP336",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP336 appears as a 180 mm bore single-row cylindrical roller bearing (1000 kN C / 1150 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 380 mm OD and 75 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 232 mm and Ew 328 mm — the envelope inside the 180/380 mm bore/OD where the rollers actually run. Thermal planning around the 1,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,000 r/min for continuously high-duty 180 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g NUP336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 100.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 75 mm-wide cavity.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NUP336: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NUP336 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 380×75 mm envelope matches.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP336?",
        "a": "NUP336 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP336 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP336 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup336",
      "NUP336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4938",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4938",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 525,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 98,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 9930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4938 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 190×260×69 mm ISO 15 envelope. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,200 r/min grease and 2,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. Rating life at 525 kN C assumes clean oil and adequate film; the 98 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 190 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 9930 g NN4938 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN4938 with a deep-groove ball bearing on rating alone: line contact gives 525 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4938 does not substitute a precision-class execution.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4938 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4938 does not substitute a precision-class execution.",
      "The 525/1030 kN ratings, 98 kN Pu and 9930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4938 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4938?",
        "a": "NN4938 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 69 mm width (7.48 × 10.236 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 525 kN, C0 1030 kN, Pu 98 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 9930 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4938 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4938 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4938?",
        "a": "NN4938 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4938?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 212 mm. The nominal bore/OD remain 190/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4938",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4938",
      "NN4938"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4938K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4938K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 525,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 98,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 9470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4938K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 525 kN dynamic rating in the 190 mm bore. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). With C 525 kN and C0 1030 kN (C0/C ≈ 1.96) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 9470 g NN4938K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4938K skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "Open NN4938K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NN4938K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4938K skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The 525/1030 kN ratings, 98 kN Pu and 9470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4938K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4938K?",
        "a": "NN4938K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 69 mm width (7.48 × 10.236 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 525 kN, C0 1030 kN, Pu 98 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 9470 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4938K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4938K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4938K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4938K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4938 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4938K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 212 mm. The nominal bore/OD remain 190/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4938K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4938k",
      "NN4938K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4938K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4938K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 525,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 98,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 9940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4938K is an NTN NNU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 190×260×69 mm ISO 15 envelope. Numbering ties NNU4938K to its envelope: type code NNU, series NNU4900, 190 mm bore; the 260×69 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NNU4938K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 2,200 r/min is .85 of the 2,600 r/min oil value for NNU4938K; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NNU4938K; an oversized radius locks the ring on its face and tilts the 69 mm-wide seat.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 9940 g NNU4938K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 35.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 69 mm-wide cavity.",
      "The K tapered bore of NNU4938K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "Do not replace NNU4938K with a deep-groove ball bearing on rating alone: line contact gives 525 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 525/1030 kN ratings, 98 kN Pu and 9940 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4938K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4938K?",
        "a": "NNU4938K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 69 mm width (7.48 × 10.236 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 525 kN, C0 1030 kN, Pu 98 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 9940 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4938K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4938K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4938K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4938K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4938 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4938K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 212 mm. The nominal bore/OD remain 190/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4938K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4938k",
      "NNU4938K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1038",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1038",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 48,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N1038 on the 190×290 mm envelope, 46 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,300 r/min. On the NTN nameplate N states which ring carries the ribs, which determines whether N1038 floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 2,300 r/min grease and 2,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. Thermal planning around the 2,300 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,700 r/min for continuously high-duty 190 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 190 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 10500 g N1038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use N1038 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use N1038 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 390/510 kN ratings, 48 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1038?",
        "a": "N1038 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 46 mm width (7.48 × 11.417 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 510 kN, Pu 48 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 10500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1038 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1038 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1038?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm, Ew 265 mm. The nominal bore/OD remain 190/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1038",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1038",
      "N1038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1038",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1038",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 48,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1038 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 190×290×46 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 290 mm OD and 46 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 215 mm and Ew 265 mm — the envelope inside the 190/290 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 10500 g NJ1038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1038 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1038 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 290×46 mm envelope matches.",
      "The 390/510 kN ratings, 48 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1038?",
        "a": "NJ1038 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 46 mm width (7.48 × 11.417 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 510 kN, Pu 48 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 10500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1038 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1038 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1038?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm, Ew 265 mm. The nominal bore/OD remain 190/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1038-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1038",
      "NJ1038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3038",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3038",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 640,
    "static_load_kN": 1040,
    "fatigue_load_limit_kN": 97,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3038 is the standard section of the NTN NN3000 dimension series for a 190 mm shaft — 640 kN of basic dynamic capacity in a 18000 g, open bearing. Digit by digit, NN3038 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,000 r/min grease and 2,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. The 190 mm (7.48 in) bore and 290 mm (11.417 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 75 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 190 mm shaft.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 18000 g NN3038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 640/1040 kN pair here belongs to NN3038 as printed, not to the bare size.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3038 does not substitute a precision-class execution.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3038 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3038 does not substitute a precision-class execution.",
      "The 640/1040 kN ratings, 97 kN Pu and 18000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3038?",
        "a": "NN3038 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 640 kN, C0 1040 kN, Pu 97 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 18000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3038 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3038?",
        "a": "NN3038 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3038?",
        "a": "NTN rates NN3038 at 2,000 r/min with grease and 2,400 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3038",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3038",
      "NN3038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3038K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3038K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 640,
    "static_load_kN": 1040,
    "fatigue_load_limit_kN": 97,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies NN3038K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,000 r/min on grease and 2,400 r/min on oil. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 290 mm OD and 75 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 97 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.63 (1040/640 kN) shows the high-static-capacity proportioning of this 190 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 190 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17400 g NN3038K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NN3038K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 640/1040 kN pair here belongs to NN3038K as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3038K skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 640/1040 kN pair here belongs to NN3038K as printed, not to the bare size.",
      "The 640/1040 kN ratings, 97 kN Pu and 17400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3038K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3038K?",
        "a": "NN3038K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 640 kN, C0 1040 kN, Pu 97 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3038K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3038K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3038K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3038K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3038 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3038K?",
        "a": "NTN rates NN3038K at 2,000 r/min with grease and 2,400 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3038K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3038k",
      "NN3038K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1038",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1038",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 48,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1038 is the extra-light (10/49) section of the NTN NU1000 dimension series for a 190 mm shaft — 390 kN of basic dynamic capacity in a 10500 g, open bearing. Digit by digit, NU1038 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU1038 designation when purchasing. Equivalent-load planning treats NU1038 as a pure radial bearing: keep P below 390 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 190 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 10500 g NU1038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 390/510 kN ratings, 48 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1038?",
        "a": "NU1038 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 46 mm width (7.48 × 11.417 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 510 kN, Pu 48 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 10500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1038 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1038 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1038?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm, Ew 265 mm. The nominal bore/OD remain 190/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1038-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1038",
      "NU1038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1038",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1038",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 48,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1038 is the extra-light (10/49) section of the NTN NUP1000 dimension series for a 190 mm shaft — 390 kN of basic dynamic capacity in a 10500 g, open bearing. Digit by digit, NUP1038 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,300 r/min grease and 2,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. The 2.1 kN-per-mm-bore figure (390 kN over 190 mm) lets a NUP1038 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP1038 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 10500 g NUP1038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1038 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "The 50.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 46 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NUP1038 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 390/510 kN ratings, 48 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1038?",
        "a": "NUP1038 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 46 mm width (7.48 × 11.417 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 510 kN, Pu 48 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 10500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1038 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1038 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1038?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm, Ew 265 mm. The nominal bore/OD remain 190/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1038",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1038",
      "NUP1038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2238",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2238",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 920,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 117,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies N2238: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,700 r/min on grease and 2,000 r/min on oil. Numbering ties N2238 to its envelope: type code N, series N2200, 190 mm bore; the 340×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,000 r/min with oil versus 1,700 r/min with grease (a 300 r/min band), lubrication choice for N2238 is a thermal decision, not just a sealing one. Thermal planning around the 1,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,000 r/min for continuously high-duty 190 mm positions. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 33700 g N2238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for N2238: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open N2238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for N2238: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 920/1290 kN ratings, 117 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2238?",
        "a": "N2238 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 920 kN, C0 1290 kN, Pu 117 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 33700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2238 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2238 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2238",
      "N2238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N238",
    "brand": "NTN",
    "manufacturer_designation": "NTN N238",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N238 is the standard section of the NTN N200 dimension series for a 190 mm shaft — 615 kN of basic dynamic capacity in a 20800 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N238 floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded N238 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 615 kN C assumes clean oil and adequate film; the 70 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g N238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Open N238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "Do not replace N238 with a deep-groove ball bearing on rating alone: line contact gives 615 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N238?",
        "a": "N238 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N238 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N238 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n238",
      "N238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF238",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF238 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 615 kN dynamic rating in the 190 mm bore. Digit by digit, NF238 reads as NF (one rib on each ring), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NF238 designation when purchasing. Selection arithmetic: Pu 70 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.25 (770/615 kN) shows the high-static-capacity proportioning of this 190 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 190 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g NF238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NF238 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF238?",
        "a": "NF238 is an NTN NF single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF238 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF238 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf238",
      "NF238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2238",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 920,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 117,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ2238 on the 190×340 mm envelope, 92 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,700 r/min. Digit by digit, NJ2238 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NJ2238 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,700 r/min is .85 of the 2,000 r/min oil value for NJ2238; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ2238; an oversized radius locks the ring on its face and tilts the 92 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 33700 g NJ2238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use NJ2238 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Do not replace NJ2238 with a deep-groove ball bearing on rating alone: line contact gives 920 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 920/1290 kN ratings, 117 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2238?",
        "a": "NJ2238 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 920 kN, C0 1290 kN, Pu 117 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 33700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2238 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2238 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×92 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2238",
      "NJ2238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2238E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 152,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ2238E on the 190×340 mm envelope, 92 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,500 r/min. Numbering ties NJ2238E to its envelope: type code NJ, series NJ2200, 190 mm bore; the 340×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 92 mm width and 75.0 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Heat the inner ring to max 120 °C for the 190 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the NJ2238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ2238E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NJ2238E with a deep-groove ball bearing on rating alone: line contact gives 1220 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Open NJ2238E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 1220/1670 kN ratings, 152 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2238E?",
        "a": "NJ2238E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1670 kN, Pu 152 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2238E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2238E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 228 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2238e",
      "NJ2238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ238",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ238 denotes a 190×340×55 mm (7.48 × 13.386 × 2.165 in) cylindrical roller bearing in the NJ200 family, a pressed sheet-steel cage. Digit by digit, NJ238 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NJ238 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 615 kN C assumes clean oil and adequate film; the 70 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NJ238; an oversized radius locks the ring on its face and tilts the 55 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g NJ238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ238 skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NJ238 with a deep-groove ball bearing on rating alone: line contact gives 615 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ238 skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NJ238 with a deep-groove ball bearing on rating alone: line contact gives 615 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ238?",
        "a": "NJ238 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ238 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ238 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj238",
      "NJ238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ238E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 770,
    "static_load_kN": 955,
    "fatigue_load_limit_kN": 86.5,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies NJ238E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,700 r/min on grease and 2,000 r/min on oil. Digit by digit, NJ238E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 4.1 kN-per-mm-bore figure (770 kN over 190 mm) lets a NJ238E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ238E.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NJ238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ238E with a deep-groove ball bearing on rating alone: line contact gives 770 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NJ238E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 770/955 kN pair here belongs to NJ238E as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 770/955 kN pair here belongs to NJ238E as printed, not to the bare size.",
      "The 770/955 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ238E?",
        "a": "NJ238E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 770 kN, C0 955 kN, Pu 86.5 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ238E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ238E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 230 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj238e",
      "NJ238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2238",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 920,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 117,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2238 denotes a 190×340×92 mm (7.48 × 13.386 × 3.622 in) cylindrical roller bearing in the NU2200 family, a pressed sheet-steel cage. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 340 mm OD and 92 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2238.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 33700 g NU2238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU2238 with a deep-groove ball bearing on rating alone: line contact gives 920 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU2238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "Open NU2238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 920/1290 kN pair here belongs to NU2238 as printed, not to the bare size.",
      "The 920/1290 kN ratings, 117 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2238?",
        "a": "NU2238 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 920 kN, C0 1290 kN, Pu 117 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 33700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2238 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2238 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×92 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2238",
      "NU2238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2238E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 152,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2238E is the wide (22) section of the NTN NU2200 dimension series for a 190 mm shaft — 1220 kN of basic dynamic capacity in a open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NU2238E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 190 mm (7.48 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 92 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2238E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the NU2238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 92 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 190 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×92 mm envelope matches.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "Do not replace NU2238E with a deep-groove ball bearing on rating alone: line contact gives 1220 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1220/1670 kN ratings, 152 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2238E?",
        "a": "NU2238E is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1670 kN, Pu 152 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2238E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2238E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 228 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2238e",
      "NU2238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU238",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies NU238: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,900 r/min on grease and 2,200 r/min on oil. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). The 75.0 mm radial section ((340−190)/2) frames the roller complement; capacity per millimetre of bore is about 3.2 kN/mm before application factors. The 190 mm (7.48 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 55 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NU238; an oversized radius locks the ring on its face and tilts the 55 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g NU238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU238 skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NU238 with a deep-groove ball bearing on rating alone: line contact gives 615 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU238?",
        "a": "NU238 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU238 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU238 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu238",
      "NU238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU238E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 770,
    "static_load_kN": 955,
    "fatigue_load_limit_kN": 86.5,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU238E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 190×340×55 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU238E floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. With C 770 kN and C0 955 kN (C0/C ≈ 1.24) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 1,700 r/min is .85 of the 2,000 r/min oil value for NU238E; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU238E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NU238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 190 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×55 mm envelope matches.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 190 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×55 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 770/955 kN pair here belongs to NU238E as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU238E skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "The 770/955 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU238E?",
        "a": "NU238E is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 770 kN, C0 955 kN, Pu 86.5 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU238E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU238E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 230 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu238e",
      "NU238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2238",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 920,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 117,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2238 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 190×340×92 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 340 mm OD and 92 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,700 r/min grease and 2,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. Selection arithmetic: Pu 117 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.40 (1290/920 kN) shows the high-static-capacity proportioning of this 190 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2238.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 33700 g NUP2238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP2238 with a deep-groove ball bearing on rating alone: line contact gives 920 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 920/1290 kN pair here belongs to NUP2238 as printed, not to the bare size.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×92 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP2238 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 920/1290 kN ratings, 117 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2238?",
        "a": "NUP2238 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 920 kN, C0 1290 kN, Pu 117 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 33700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2238 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2238 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2238",
      "NUP2238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2238E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 152,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2238E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1220 kN dynamic rating in the 190 mm bore. Digit by digit, NUP2238E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 75.0 mm radial section ((340−190)/2) frames the roller complement; capacity per millimetre of bore is about 6.4 kN/mm before application factors. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 1,800 r/min for continuously high-duty 190 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2238E.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the NUP2238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2238E skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×92 mm envelope matches.",
      "The 92 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "The 1220/1670 kN ratings, 152 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2238E?",
        "a": "NUP2238E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1670 kN, Pu 152 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2238E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2238E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 228 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2238e",
      "NUP2238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP238",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP238 appears as a 190 mm bore single-row cylindrical roller bearing (615 kN C / 770 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP238 to its envelope: type code NUP, series NUP200, 190 mm bore; the 340×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 55 mm width and 75.0 mm section put the NUP200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 70 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.25 (770/615 kN) shows the high-static-capacity proportioning of this 190 mm bore. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 190 mm shaft.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g NUP238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "Open NUP238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP238?",
        "a": "NUP238 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP238 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP238 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup238",
      "NUP238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP238E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 770,
    "static_load_kN": 955,
    "fatigue_load_limit_kN": 86.5,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP238E on the 190×340 mm envelope, 55 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,700 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP238E floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. The 75.0 mm radial section ((340−190)/2) frames the roller complement; capacity per millimetre of bore is about 4.1 kN/mm before application factors. Selection arithmetic: Pu 86.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.24 (955/770 kN) shows the high-static-capacity proportioning of this 190 mm bore. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NUP238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×55 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP238E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "The 770/955 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP238E?",
        "a": "NUP238E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 770 kN, C0 955 kN, Pu 86.5 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP238E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP238E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 230 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup238e",
      "NUP238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2338",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2338",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2220,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2338 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1680 kN dynamic rating in the 190 mm bore. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 400 mm OD and 132 mm width from the ISO 15 general plan. The 132 mm width and 105.0 mm section put the N2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 78900 g for the 190×400×132 mm N2338 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 78900 g N2338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 105.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 132 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2338 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The N rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 400×132 mm envelope matches.",
      "Open N2338 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 1680/2220 kN ratings, 196 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2338?",
        "a": "N2338 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2220 kN, Pu 196 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 78900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2338 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2338 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2338",
      "N2338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N338",
    "brand": "NTN",
    "manufacturer_designation": "NTN N338",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N338 denotes a 190×400×78 mm (7.48 × 15.748 × 3.071 in) cylindrical roller bearing in the N300 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N338 designation when purchasing. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,900 r/min for continuously high-duty 190 mm positions. Housing and shaft fillets must clear the ring chamfers of N338; an oversized radius locks the ring on its face and tilts the 78 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g N338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N338 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 78 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 78 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N338?",
        "a": "N338 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N338 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N338 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n338",
      "N338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF338",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF338 appears as a 190 mm bore single-row cylindrical roller bearing (1080 kN C / 1260 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NF338 to its envelope: type code NF, series NF300, 190 mm bore; the 400×78 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 245 mm and Ew 345 mm — the envelope inside the 190/400 mm bore/OD where the rollers actually run. Mass 48300 g for the 190×400×78 mm NF338 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF338 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g NF338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 190 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 400×78 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF338 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 190 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 400×78 mm envelope matches.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF338?",
        "a": "NF338 is an NTN NF single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF338 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF338 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf338",
      "NF338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2338",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2220,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies NJ2338: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,400 r/min on grease and 1,700 r/min on oil. Numbering ties NJ2338 to its envelope: type code NJ, series NJ2300, 190 mm bore; the 400×132 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ2338 designation when purchasing. Equivalent-load planning treats NJ2338 as a pure radial bearing: keep P below 1680 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 190 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 78900 g NJ2338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ2338 with a deep-groove ball bearing on rating alone: line contact gives 1680 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1680/2220 kN pair here belongs to NJ2338 as printed, not to the bare size.",
      "Grease limiting speed 1,400 r/min and oil 1,700 r/min are different limits for NJ2338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 132 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 1680/2220 kN ratings, 196 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2338?",
        "a": "NJ2338 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2220 kN, Pu 196 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 78900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2338 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2338 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2338-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×400×132 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2338",
      "NJ2338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ338",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ338 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 190×400×78 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 400 mm OD and 78 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 245 mm and Ew 345 mm — the envelope inside the 190/400 mm bore/OD where the rollers actually run. The 5.7 kN-per-mm-bore figure (1080 kN over 190 mm) lets a NJ338 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NJ338; an oversized radius locks the ring on its face and tilts the 78 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g NJ338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NJ338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NJ338 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 400×78 mm envelope matches.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ338?",
        "a": "NJ338 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ338 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ338 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj338",
      "NJ338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2338",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2220,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2338 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 190×400×132 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NU2338 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 1680 kN C assumes clean oil and adequate film; the 196 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2338.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 78900 g NU2338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 190 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 400×132 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2338 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,400 r/min and oil 1,700 r/min are different limits for NU2338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NU2338 with a deep-groove ball bearing on rating alone: line contact gives 1680 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1680/2220 kN ratings, 196 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2338?",
        "a": "NU2338 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2220 kN, Pu 196 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 78900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2338 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2338 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2338-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×400×132 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2338",
      "NU2338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU338",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU338 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1080 kN dynamic rating in the 190 mm bore. Numbering ties NU338 to its envelope: type code NU, series NU300, 190 mm bore; the 400×78 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. Mass 48300 g for the 190×400×78 mm NU338 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NU338; an oversized radius locks the ring on its face and tilts the 78 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g NU338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NU338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NU338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NU338 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU338?",
        "a": "NU338 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU338 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU338 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU338-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×400×78 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu338",
      "NU338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2338",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2220,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2338 on the 190×400 mm envelope, 132 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,400 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2338. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 190 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 78900 g NUP2338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 400×132 mm envelope matches.",
      "The 132 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1680/2220 kN pair here belongs to NUP2338 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The 1680/2220 kN ratings, 196 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2338?",
        "a": "NUP2338 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2220 kN, Pu 196 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 78900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2338 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2338 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2338",
      "NUP2338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP338",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP338 is the standard section of the NTN NUP300 dimension series for a 190 mm shaft — 1080 kN of basic dynamic capacity in a 48300 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP338 floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP338. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for NUP338; grease-churn heating closes that gap as fill quantity rises. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 190 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g NUP338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 400×78 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP338?",
        "a": "NUP338 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP338 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP338 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup338",
      "NUP338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4940",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4940",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 1180,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 14000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN4940 on the 200×280 mm envelope, 80 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 2,100 r/min. Numbering ties NN4940 to its envelope: type code NN, series NN4900, 200 mm bore; the 280×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 225 mm — the envelope inside the 200/280 mm bore/OD where the rollers actually run. The 200 mm (7.874 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN4940 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 14000 g NN4940 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN4940 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 40.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The 40.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 200 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 280×80 mm envelope matches.",
      "The 615/1180 kN ratings, 110 kN Pu and 14000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4940 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4940?",
        "a": "NN4940 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 80 mm width (7.874 × 11.024 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 1180 kN, Pu 110 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 14000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4940 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4940 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4940?",
        "a": "NN4940 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4940?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 225 mm. The nominal bore/OD remain 200/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4940",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4940",
      "NN4940"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4940K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4940K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 1180,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 13300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN4940K denotes a 200×280×80 mm (7.874 × 11.024 × 3.15 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4940K floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 225 mm — the envelope inside the 200/280 mm bore/OD where the rollers actually run. Rating life at 615 kN C assumes clean oil and adequate film; the 110 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 13300 g NN4940K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The K tapered bore of NN4940K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 615/1180 kN pair here belongs to NN4940K as printed, not to the bare size.",
      "Open NN4940K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 200 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 280×80 mm envelope matches.",
      "The 615/1180 kN ratings, 110 kN Pu and 13300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4940K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4940K?",
        "a": "NN4940K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 80 mm width (7.874 × 11.024 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 1180 kN, Pu 110 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 13300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4940K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4940K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4940K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4940K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4940 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4940K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 225 mm. The nominal bore/OD remain 200/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4940K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4940k",
      "NN4940K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4940K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4940K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 1180,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 14000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4940K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 615 kN dynamic rating in the 200 mm bore. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The 80 mm width and 40.0 mm section put the NNU4900 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 200 mm (7.874 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NNU4940K.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 14000 g NNU4940K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 615/1180 kN pair here belongs to NNU4940K as printed, not to the bare size.",
      "Open NNU4940K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 615/1180 kN ratings, 110 kN Pu and 14000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4940K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4940K?",
        "a": "NNU4940K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 80 mm width (7.874 × 11.024 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 1180 kN, Pu 110 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 14000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4940K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4940K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4940K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4940K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4940 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4940K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 225 mm. The nominal bore/OD remain 200/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4940K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4940k",
      "NNU4940K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1040",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1040",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 430,
    "static_load_kN": 580,
    "fatigue_load_limit_kN": 53.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 13700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 200 mm shaft NTN supplies N1040: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. Digit by digit, N1040 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 200 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 229 mm and Ew 281 mm — the envelope inside the 200/310 mm bore/OD where the rollers actually run. Rating life at 430 kN C assumes clean oil and adequate film; the 53.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of N1040; an oversized radius locks the ring on its face and tilts the 51 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 13700 g N1040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N1040 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open N1040 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The N rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×51 mm envelope matches.",
      "The N rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×51 mm envelope matches.",
      "The 430/580 kN ratings, 53.5 kN Pu and 13700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1040?",
        "a": "N1040 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 51 mm width (7.874 × 12.205 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 430 kN, C0 580 kN, Pu 53.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 13700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1040 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1040 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1040?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 229 mm, Ew 281 mm. The nominal bore/OD remain 200/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1040",
      "N1040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1040",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1040",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 430,
    "static_load_kN": 580,
    "fatigue_load_limit_kN": 53.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 13700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ1040 on the 200×310 mm envelope, 51 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,200 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 2.1 kN-per-mm-bore figure (430 kN over 200 mm) lets a NJ1040 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 13700 g NJ1040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 310×51 mm envelope matches.",
      "If the shaft must be located both ways, do not use NJ1040 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NJ1040: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 430/580 kN pair here belongs to NJ1040 as printed, not to the bare size.",
      "The 430/580 kN ratings, 53.5 kN Pu and 13700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1040?",
        "a": "NJ1040 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 51 mm width (7.874 × 12.205 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 430 kN, C0 580 kN, Pu 53.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 13700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1040 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1040 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1040?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 229 mm, Ew 281 mm. The nominal bore/OD remain 200/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1040",
      "NJ1040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3040",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3040",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 725,
    "static_load_kN": 1170,
    "fatigue_load_limit_kN": 107,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2300,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3040 denotes a 200×310×82 mm (7.874 × 12.205 × 3.228 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 310 mm OD and 82 mm width from the ISO 15 general plan. The roller-set pitch sits inside the 55.0 mm radial section between the 200 mm bore and 310 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Equivalent-load planning treats NN3040 as a pure radial bearing: keep P below 725 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 21600 g NN3040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,900 r/min and oil 2,300 r/min are different limits for NN3040: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 200 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 310×82 mm envelope matches.",
      "The 725/1170 kN ratings, 107 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3040?",
        "a": "NN3040 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 82 mm width (7.874 × 12.205 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 725 kN, C0 1170 kN, Pu 107 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min, mass about 21600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3040 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3040?",
        "a": "NN3040 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3040?",
        "a": "NTN rates NN3040 at 1,900 r/min with grease and 2,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3040",
      "NN3040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3040K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3040K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 725,
    "static_load_kN": 1170,
    "fatigue_load_limit_kN": 107,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2300,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3040K is the standard section of the NTN NN3000 dimension series for a 200 mm shaft — 725 kN of basic dynamic capacity in a 20800 g, open bearing. Numbering ties NN3040K to its envelope: type code NN, series NN3000, 200 mm bore; the 310×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 55.0 mm radial section ((310−200)/2) frames the roller complement; capacity per millimetre of bore is about 3.6 kN/mm before application factors. Equivalent-load planning treats NN3040K as a pure radial bearing: keep P below 725 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 20800 g NN3040K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 82 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 200 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 310×82 mm envelope matches.",
      "The 82 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "The 725/1170 kN ratings, 107 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3040K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3040K?",
        "a": "NN3040K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 82 mm width (7.874 × 12.205 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 725 kN, C0 1170 kN, Pu 107 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min, mass about 20800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3040K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3040K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3040K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3040K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3040 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3040K?",
        "a": "NTN rates NN3040K at 1,900 r/min with grease and 2,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3040K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3040k",
      "NN3040K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1040",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1040",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 430,
    "static_load_kN": 580,
    "fatigue_load_limit_kN": 53.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 13700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU1040 denotes a 200×310×51 mm (7.874 × 12.205 × 2.008 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 310 mm OD and 51 mm width from the ISO 15 general plan. With C 430 kN and C0 580 kN (C0/C ≈ 1.35) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 2,200 r/min is .85 of the 2,600 r/min oil value for NU1040; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 13700 g NU1040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 51 mm-wide cavity.",
      "Open NU1040 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NU1040: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1040 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The 430/580 kN ratings, 53.5 kN Pu and 13700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1040?",
        "a": "NU1040 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 51 mm width (7.874 × 12.205 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 430 kN, C0 580 kN, Pu 53.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 13700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1040 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1040 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1040?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 229 mm, Ew 281 mm. The nominal bore/OD remain 200/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1040-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×310×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1040",
      "NU1040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1040",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1040",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 430,
    "static_load_kN": 580,
    "fatigue_load_limit_kN": 53.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 13700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP1040 denotes a 200×310×51 mm (7.874 × 12.205 × 2.008 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 310 mm OD and 51 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 229 mm and Ew 281 mm — the envelope inside the 200/310 mm bore/OD where the rollers actually run. Mass 13700 g for the 200×310×51 mm NUP1040 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 200 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 13700 g NUP1040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 51 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NUP1040 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NUP1040 with a deep-groove ball bearing on rating alone: line contact gives 430 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 310×51 mm envelope matches.",
      "The 430/580 kN ratings, 53.5 kN Pu and 13700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1040?",
        "a": "NUP1040 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 51 mm width (7.874 × 12.205 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 430 kN, C0 580 kN, Pu 53.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 13700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1040 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1040 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1040?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 229 mm, Ew 281 mm. The nominal bore/OD remain 200/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1040",
      "NUP1040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2240",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2240",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1440,
    "fatigue_load_limit_kN": 129,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 40500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2240 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1020 kN dynamic rating in the 200 mm bore. On the NTN nameplate N states which ring carries the ribs, which determines whether N2240 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2240 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 1020 kN C assumes clean oil and adequate film; the 129 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 40500 g N2240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2240 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for N2240: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace N2240 with a deep-groove ball bearing on rating alone: line contact gives 1020 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1020/1440 kN ratings, 129 kN Pu and 40500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2240?",
        "a": "N2240 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1440 kN, Pu 129 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 40500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2240 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2240 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2240",
      "N2240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N240",
    "brand": "NTN",
    "manufacturer_designation": "NTN N240",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N240 denotes a 200×360×58 mm (7.874 × 14.173 × 2.283 in) cylindrical roller bearing in the N200 family, a pressed sheet-steel cage. Digit by digit, N240 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 200 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N240. The 200 mm (7.874 in) bore and 360 mm (14.173 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 58 mm-wide ring. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g N240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Open N240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N240?",
        "a": "N240 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N240 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N240 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n240",
      "N240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF240",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF240 appears as a 200 mm bore single-row cylindrical roller bearing (690 kN C / 865 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 58 mm width from the ISO 15 general plan. With C 690 kN and C0 865 kN (C0/C ≈ 1.25) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,100 r/min for continuously high-duty 200 mm positions. Housing and shaft fillets must clear the ring chamfers of NF240; an oversized radius locks the ring on its face and tilts the 58 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g NF240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NF240 with a deep-groove ball bearing on rating alone: line contact gives 690 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF240 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF240 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF240 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF240?",
        "a": "NF240 is an NTN NF single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF240 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF240 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf240",
      "NF240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2240",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1440,
    "fatigue_load_limit_kN": 129,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 40500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 200 mm shaft NTN supplies NJ2240: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,600 r/min on grease and 1,900 r/min on oil. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 98 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2240. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2240.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 40500 g NJ2240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 98 mm-wide cavity.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 98 mm-wide cavity.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NJ2240: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 1020/1440 kN ratings, 129 kN Pu and 40500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2240?",
        "a": "NJ2240 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1440 kN, Pu 129 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 40500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2240 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2240 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2240-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×98 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2240",
      "NJ2240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2240E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1350,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2240E appears as a 200 mm bore single-row cylindrical roller bearing (1350 kN C / 1870 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Digit by digit, NJ2240E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 200 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NJ2240E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 1350 kN C assumes clean oil and adequate film; the 167 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2240E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the NJ2240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 98 mm-wide cavity.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 98 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1350/1870 kN pair here belongs to NJ2240E as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1350/1870 kN ratings, 167 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2240E?",
        "a": "NJ2240E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1350 kN, C0 1870 kN, Pu 167 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2240E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2240E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 241 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2240e",
      "NJ2240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ240",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ240 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 200×360×58 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 58 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ240. The 200 mm (7.874 in) bore and 360 mm (14.173 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 58 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ240.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g NJ240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 360×58 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 690/865 kN pair here belongs to NJ240 as printed, not to the bare size.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ240?",
        "a": "NJ240 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ240 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ240 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ240-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj240",
      "NJ240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ240E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 850,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 95,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ240E is the standard section of the NTN NJ200 dimension series for a 200 mm shaft — 850 kN of basic dynamic capacity in a open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The 80.0 mm radial section ((360−200)/2) frames the roller complement; capacity per millimetre of bore is about 4.3 kN/mm before application factors. Rating life at 850 kN C assumes clean oil and adequate film; the 95 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ240E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NJ240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 850/1060 kN pair here belongs to NJ240E as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 360×58 mm envelope matches.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.",
      "The 850/1060 kN ratings, 95 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ240E?",
        "a": "NJ240E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 850 kN, C0 1060 kN, Pu 95 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ240E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ240E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 243 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj240e",
      "NJ240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2240",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1440,
    "fatigue_load_limit_kN": 129,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 40500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2240 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 200×360×98 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The 98 mm width and 80.0 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 5.1 kN-per-mm-bore figure (1020 kN over 200 mm) lets a NU2240 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 40500 g NU2240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU2240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NU2240: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 98 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Open NU2240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 1020/1440 kN ratings, 129 kN Pu and 40500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2240?",
        "a": "NU2240 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1440 kN, Pu 129 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 40500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2240 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2240 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2240-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×98 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2240",
      "NU2240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2240E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1350,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU2240E on the 200×360 mm envelope, 98 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,500 r/min. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 98 mm width from the ISO 15 general plan. The 98 mm width and 80.0 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 1,700 r/min for continuously high-duty 200 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 200 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the NU2240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1350/1870 kN pair here belongs to NU2240E as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NU2240E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NU2240E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NU2240E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 1350/1870 kN ratings, 167 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2240E?",
        "a": "NU2240E is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1350 kN, C0 1870 kN, Pu 167 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2240E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2240E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 241 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2240e",
      "NU2240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU240",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU240 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 690 kN dynamic rating in the 200 mm bore. Numbering ties NU240 to its envelope: type code NU, series NU200, 200 mm bore; the 360×58 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NU240 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NU240 as a pure radial bearing: keep P below 690 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU240.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g NU240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 200 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 360×58 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 690/865 kN pair here belongs to NU240 as printed, not to the bare size.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Do not replace NU240 with a deep-groove ball bearing on rating alone: line contact gives 690 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU240?",
        "a": "NU240 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU240 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU240 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU240-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu240",
      "NU240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU240E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 850,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 95,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU240E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 850 kN dynamic rating in the 200 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 58 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 243 mm — the envelope inside the 200/360 mm bore/OD where the rollers actually run. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 1,900 r/min for continuously high-duty 200 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 200 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NU240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU240E with a deep-groove ball bearing on rating alone: line contact gives 850 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NU240E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NU240E with a deep-groove ball bearing on rating alone: line contact gives 850 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 200 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 360×58 mm envelope matches.",
      "The 850/1060 kN ratings, 95 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU240E?",
        "a": "NU240E is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 850 kN, C0 1060 kN, Pu 95 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU240E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU240E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 243 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu240e",
      "NU240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2240",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1440,
    "fatigue_load_limit_kN": 129,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 40500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2240 on the 200×360 mm envelope, 98 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,600 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 244 mm and Ew 316 mm — the envelope inside the 200/360 mm bore/OD where the rollers actually run. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,900 r/min for continuously high-duty 200 mm positions. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 40500 g NUP2240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1440 kN pair here belongs to NUP2240 as printed, not to the bare size.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 360×98 mm envelope matches.",
      "The 1020/1440 kN ratings, 129 kN Pu and 40500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2240?",
        "a": "NUP2240 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1440 kN, Pu 129 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 40500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2240 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2240 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2240",
      "NUP2240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2240E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1350,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2240E denotes a 200×360×98 mm (7.874 × 14.173 × 3.858 in) cylindrical roller bearing in the NUP2200 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2240E floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NUP2240E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 6.8 kN-per-mm-bore figure (1350 kN over 200 mm) lets a NUP2240E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2240E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the NUP2240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2240E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "If the shaft must be located both ways, do not use NUP2240E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NUP2240E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1350/1870 kN ratings, 167 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2240E?",
        "a": "NUP2240E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1350 kN, C0 1870 kN, Pu 167 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2240E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2240E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 241 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2240e",
      "NUP2240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP240",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP240 is the standard section of the NTN NUP200 dimension series for a 200 mm shaft — 690 kN of basic dynamic capacity in a 24800 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP240 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP240 designation when purchasing. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,100 r/min for continuously high-duty 200 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g NUP240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NUP240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Do not replace NUP240 with a deep-groove ball bearing on rating alone: line contact gives 690 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP240?",
        "a": "NUP240 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP240 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP240 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup240",
      "NUP240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP240E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 850,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 95,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP240E appears as a 200 mm bore single-row cylindrical roller bearing (850 kN C / 1060 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 58 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP240E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NUP240E as a pure radial bearing: keep P below 850 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 200 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NUP240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP240E with a deep-groove ball bearing on rating alone: line contact gives 850 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP240E skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 850/1060 kN ratings, 95 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP240E?",
        "a": "NUP240E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 850 kN, C0 1060 kN, Pu 95 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP240E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP240E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 243 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup240e",
      "NUP240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2340",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2340",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 195,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 90700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2340 appears as a 200 mm bore single-row cylindrical roller bearing (1680 kN C / 2240 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N2340 designation when purchasing. Selection arithmetic: Pu 195 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.33 (2240/1680 kN) shows the high-static-capacity proportioning of this 200 mm bore. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 90700 g N2340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1680/2240 kN pair here belongs to N2340 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use N2340 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1680/2240 kN pair here belongs to N2340 as printed, not to the bare size.",
      "The 138 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The 1680/2240 kN ratings, 195 kN Pu and 90700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2340?",
        "a": "N2340 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2240 kN, Pu 195 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 90700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2340 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2340 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2340",
      "N2340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N340",
    "brand": "NTN",
    "manufacturer_designation": "NTN N340",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N340 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 200×420×80 mm ISO 15 envelope. Numbering ties N340 to its envelope: type code N, series N300, 200 mm bore; the 420×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 1080 kN and C0 1270 kN (C0/C ≈ 1.18) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Rating life at 1080 kN C assumes clean oil and adequate film; the 111 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N340.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g N340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 420×80 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N340 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N340 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N340 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N340?",
        "a": "N340 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N340 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N340 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n340",
      "N340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF340",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF340 is the standard section of the NTN NF300 dimension series for a 200 mm shaft — 1080 kN of basic dynamic capacity in a 54500 g, open bearing. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF340 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 111 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.18 (1270/1080 kN) shows the high-static-capacity proportioning of this 200 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 200 mm shaft.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g NF340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Do not replace NF340 with a deep-groove ball bearing on rating alone: line contact gives 1080 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 110.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1080/1270 kN pair here belongs to NF340 as printed, not to the bare size.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF340?",
        "a": "NF340 is an NTN NF single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF340 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF340 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf340",
      "NF340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2340",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 195,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 90700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2340 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1680 kN dynamic rating in the 200 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2340 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. With C 1680 kN and C0 2240 kN (C0/C ≈ 1.33) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Speed ratio check: limiting 1,400 r/min is .88 of the 1,600 r/min oil value for NJ2340; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 90700 g NJ2340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2340 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2340 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 1680/2240 kN ratings, 195 kN Pu and 90700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2340?",
        "a": "NJ2340 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2240 kN, Pu 195 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 90700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2340 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2340 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2340-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×420×138 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2340",
      "NJ2340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ340",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ340 on the 200×420 mm envelope, 80 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,500 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 54500 g for the 200×420×80 mm NJ340 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ340.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g NJ340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 420×80 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1080/1270 kN pair here belongs to NJ340 as printed, not to the bare size.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ340?",
        "a": "NJ340 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ340 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ340 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ340-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×420×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj340",
      "NJ340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2340",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 195,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 90700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU2340 on the 200×420 mm envelope, 138 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,400 r/min. Numbering ties NU2340 to its envelope: type code NU, series NU2300, 200 mm bore; the 420×138 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2340. The 200 mm (7.874 in) bore and 420 mm (16.535 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 138 mm-wide ring. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 90700 g NU2340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NU2340 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "The 1680/2240 kN ratings, 195 kN Pu and 90700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2340?",
        "a": "NU2340 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2240 kN, Pu 195 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 90700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2340 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2340 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2340-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×420×138 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2340",
      "NU2340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU340",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU340 appears as a 200 mm bore single-row cylindrical roller bearing (1080 kN C / 1270 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU340 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 260 mm and Ew 360 mm — the envelope inside the 200/420 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 111 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.18 (1270/1080 kN) shows the high-static-capacity proportioning of this 200 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU340.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g NU340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 200 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 420×80 mm envelope matches.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU340?",
        "a": "NU340 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU340 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU340 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU340-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×420×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu340",
      "NU340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2340",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 195,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 90700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 200 mm shaft NTN supplies NUP2340: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,400 r/min on grease and 1,600 r/min on oil. Numbering ties NUP2340 to its envelope: type code NUP, series NUP2300, 200 mm bore; the 420×138 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 1,600 r/min with oil versus 1,400 r/min with grease (a 200 r/min band), lubrication choice for NUP2340 is a thermal decision, not just a sealing one. The 8.4 kN-per-mm-bore figure (1680 kN over 200 mm) lets a NUP2340 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NUP2340; an oversized radius locks the ring on its face and tilts the 138 mm-wide seat.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 90700 g NUP2340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NUP2340 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NUP2340: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1680/2240 kN ratings, 195 kN Pu and 90700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2340?",
        "a": "NUP2340 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2240 kN, Pu 195 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 90700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2340 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2340 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2340",
      "NUP2340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP340",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP340 denotes a 200×420×80 mm (7.874 × 16.535 × 3.15 in) cylindrical roller bearing in the NUP300 family, a pressed sheet-steel cage. Digit by digit, NUP340 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 200 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 1,800 r/min with oil versus 1,500 r/min with grease (a 300 r/min band), lubrication choice for NUP340 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g NUP340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP340 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1080/1270 kN pair here belongs to NUP340 as printed, not to the bare size.",
      "Grease limiting speed 1,500 r/min and oil 1,800 r/min are different limits for NUP340: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP340?",
        "a": "NUP340 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP340 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP340 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup340",
      "NUP340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4944",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4944",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 650,
    "static_load_kN": 1300,
    "fatigue_load_limit_kN": 118,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 15200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4944 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 650 kN dynamic rating in the 220 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4944 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Rating life at 650 kN C assumes clean oil and adequate film; the 118 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 15200 g NN4944 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN4944 with a deep-groove ball bearing on rating alone: line contact gives 650 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 650/1300 kN ratings, 118 kN Pu and 15200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4944 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4944?",
        "a": "NN4944 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 80 mm width (8.661 × 11.811 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 650 kN, C0 1300 kN, Pu 118 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 15200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4944 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4944 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4944?",
        "a": "NN4944 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4944?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm. The nominal bore/OD remain 220/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4944",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4944",
      "NN4944"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4944K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4944K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 650,
    "static_load_kN": 1300,
    "fatigue_load_limit_kN": 118,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4944K is the extra-light (10/49) section of the NTN NN4900 dimension series for a 220 mm shaft — 650 kN of basic dynamic capacity in a 14500 g, open bearing. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 220 mm, with 300 mm OD and 80 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NN4944K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 3.0 kN-per-mm-bore figure (650 kN over 220 mm) lets a NN4944K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 220 mm shaft.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 14500 g NN4944K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4944K skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NN4944K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 220 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 300×80 mm envelope matches.",
      "Do not replace NN4944K with a deep-groove ball bearing on rating alone: line contact gives 650 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 650/1300 kN ratings, 118 kN Pu and 14500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4944K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4944K?",
        "a": "NN4944K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 80 mm width (8.661 × 11.811 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 650 kN, C0 1300 kN, Pu 118 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 14500 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4944K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4944K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4944K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4944K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4944 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4944K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm. The nominal bore/OD remain 220/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4944K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4944k",
      "NN4944K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4944K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4944K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 650,
    "static_load_kN": 1300,
    "fatigue_load_limit_kN": 118,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 15200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 220 mm shaft NTN supplies NNU4944K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,900 r/min on grease and 2,200 r/min on oil. On the NTN nameplate NNU states which ring carries the ribs, which determines whether NNU4944K floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. At 2,200 r/min with oil versus 1,900 r/min with grease (a 300 r/min band), lubrication choice for NNU4944K is a thermal decision, not just a sealing one. Mass 15200 g for the 220×300×80 mm NNU4944K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 220 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 15200 g NNU4944K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NNU4944K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 40.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The K tapered bore of NNU4944K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NNU4944K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 650/1300 kN ratings, 118 kN Pu and 15200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4944K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4944K?",
        "a": "NNU4944K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 80 mm width (8.661 × 11.811 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 650 kN, C0 1300 kN, Pu 118 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 15200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4944K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4944K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4944K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4944K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4944 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4944K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm. The nominal bore/OD remain 220/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4944K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4944k",
      "NNU4944K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1044",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1044",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 67,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N1044 appears as a 220 mm bore single-row cylindrical roller bearing (555 kN C / 750 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 220 mm, with 340 mm OD and 56 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1044 designation when purchasing. Thermal planning around the 2,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,300 r/min for continuously high-duty 220 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 220 mm shaft.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 17900 g N1044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1044 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "Open N1044 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 220 mm contact.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 555/750 kN ratings, 67 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1044?",
        "a": "N1044 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 56 mm width (8.661 × 13.386 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 750 kN, Pu 67 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 17900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1044 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1044 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1044?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 250 mm, Ew 310 mm. The nominal bore/OD remain 220/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1044",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1044",
      "N1044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1044",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1044",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 67,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1044 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 555 kN dynamic rating in the 220 mm bore. Numbering ties NJ1044 to its envelope: type code NJ, series NJ1000, 220 mm bore; the 340×56 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 555 kN and C0 750 kN (C0/C ≈ 1.35) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1044.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 17900 g NJ1044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1044 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 555/750 kN pair here belongs to NJ1044 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NJ1044 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1044 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The 555/750 kN ratings, 67 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1044?",
        "a": "NJ1044 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 56 mm width (8.661 × 13.386 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 750 kN, Pu 67 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 17900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1044 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1044 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1044?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 250 mm, Ew 310 mm. The nominal bore/OD remain 220/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1044-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×340×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1044",
      "NJ1044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3044",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3044",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 905,
    "static_load_kN": 1480,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 29300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN3044 on the 220×340 mm envelope, 90 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,700 r/min. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. The 220 mm (8.661 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 90 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3044 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 29300 g NN3044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 905/1480 kN pair here belongs to NN3044 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 90 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 905/1480 kN ratings, 132 kN Pu and 29300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3044?",
        "a": "NN3044 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 90 mm width (8.661 × 13.386 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 905 kN, C0 1480 kN, Pu 132 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 29300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3044 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3044?",
        "a": "NN3044 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3044?",
        "a": "NTN rates NN3044 at 1,700 r/min with grease and 2,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3044",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3044",
      "NN3044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3044K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3044K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 905,
    "static_load_kN": 1480,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 28200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3044K appears as a 220 mm bore single-row cylindrical roller bearing (905 kN C / 1480 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Digit by digit, NN3044K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The roller-set pitch sits inside the 60.0 mm radial section between the 220 mm bore and 340 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Selection arithmetic: Pu 132 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.64 (1480/905 kN) shows the high-static-capacity proportioning of this 220 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3044K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 28200 g NN3044K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,700 r/min and oil 2,100 r/min are different limits for NN3044K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 905/1480 kN pair here belongs to NN3044K as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 220 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 340×90 mm envelope matches.",
      "The 905/1480 kN ratings, 132 kN Pu and 28200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3044K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3044K?",
        "a": "NN3044K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 90 mm width (8.661 × 13.386 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 905 kN, C0 1480 kN, Pu 132 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 28200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3044K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3044K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3044K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3044K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3044 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3044K?",
        "a": "NTN rates NN3044K at 1,700 r/min with grease and 2,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3044K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3044k",
      "NN3044K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1044",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1044",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 67,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU1044 on the 220×340 mm envelope, 56 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,000 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1044. Equivalent-load planning treats NU1044 as a pure radial bearing: keep P below 555 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1044 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 17900 g NU1044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1044 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NU1044 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 555/750 kN ratings, 67 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1044?",
        "a": "NU1044 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 56 mm width (8.661 × 13.386 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 750 kN, Pu 67 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 17900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1044 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1044 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1044?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 250 mm, Ew 310 mm. The nominal bore/OD remain 220/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1044-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×340×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1044",
      "NU1044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1044",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1044",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 67,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP1044 on the 220×340 mm envelope, 56 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,000 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1044 designation when purchasing. The 2.5 kN-per-mm-bore figure (555 kN over 220 mm) lets a NUP1044 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 220 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 17900 g NUP1044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 555/750 kN pair here belongs to NUP1044 as printed, not to the bare size.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NUP1044: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 555/750 kN ratings, 67 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1044?",
        "a": "NUP1044 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 56 mm width (8.661 × 13.386 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 750 kN, Pu 67 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 17900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1044 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1044 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1044?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 250 mm, Ew 310 mm. The nominal bore/OD remain 220/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1044",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1044",
      "NUP1044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2244",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2244",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1260,
    "static_load_kN": 1810,
    "fatigue_load_limit_kN": 157,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 57800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2244 is the wide (22) section of the NTN N2200 dimension series for a 220 mm shaft — 1260 kN of basic dynamic capacity in a 57800 g, open bearing. Digit by digit, N2244 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,700 r/min for continuously high-duty 220 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2244.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 57800 g N2244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for N2244: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use N2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for N2244: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1260/1810 kN pair here belongs to N2244 as printed, not to the bare size.",
      "The 1260/1810 kN ratings, 157 kN Pu and 57800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2244?",
        "a": "N2244 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1260 kN, C0 1810 kN, Pu 157 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 57800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2244 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2244 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2244",
      "N2244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N244",
    "brand": "NTN",
    "manufacturer_designation": "NTN N244",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N244 on the 220×400 mm envelope, 65 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,600 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 220 mm, with 400 mm OD and 65 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 220 mm bore. Rating life at 845 kN C assumes clean oil and adequate film; the 94 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N244.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g N244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N244 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 90.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "If the shaft must be located both ways, do not use N244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N244?",
        "a": "N244 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N244 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N244 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n244",
      "N244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF244",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NF244 denotes a 220×400×65 mm (8.661 × 15.748 × 2.559 in) cylindrical roller bearing in the NF200 family, a pressed sheet-steel cage. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF244. Selection arithmetic: Pu 94 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.28 (1080/845 kN) shows the high-static-capacity proportioning of this 220 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 220 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g NF244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NF244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NF244 with a deep-groove ball bearing on rating alone: line contact gives 845 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NF244 with a deep-groove ball bearing on rating alone: line contact gives 845 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF244?",
        "a": "NF244 is an NTN NF single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF244 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF244 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf244",
      "NF244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2244",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1260,
    "static_load_kN": 1810,
    "fatigue_load_limit_kN": 157,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 57800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2244 appears as a 220 mm bore single-row cylindrical roller bearing (1260 kN C / 1810 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,500 r/min grease and 1,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 220 mm bore. Speed ratio check: limiting 1,500 r/min is .88 of the 1,700 r/min oil value for NJ2244; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 57800 g NJ2244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NJ2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1260/1810 kN ratings, 157 kN Pu and 57800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2244?",
        "a": "NJ2244 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1260 kN, C0 1810 kN, Pu 157 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 57800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2244 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2244 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2244",
      "NJ2244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ244",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 220 mm shaft NTN supplies NJ244: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,600 r/min on grease and 1,900 r/min on oil. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 220 mm bore. Rating life at 845 kN C assumes clean oil and adequate film; the 94 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g NJ244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ244 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ244?",
        "a": "NJ244 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ244 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ244 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj244",
      "NJ244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2244",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1260,
    "static_load_kN": 1810,
    "fatigue_load_limit_kN": 157,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 57800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 220 mm shaft NTN supplies NU2244: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,500 r/min on grease and 1,700 r/min on oil. Numbering ties NU2244 to its envelope: type code NU, series NU2200, 220 mm bore; the 400×108 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 90.0 mm radial section ((400−220)/2) frames the roller complement; capacity per millimetre of bore is about 5.7 kN/mm before application factors. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Housing and shaft fillets must clear the ring chamfers of NU2244; an oversized radius locks the ring on its face and tilts the 108 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 57800 g NU2244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU2244 with a deep-groove ball bearing on rating alone: line contact gives 1260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NU2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 90.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.",
      "The 90.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.",
      "The 1260/1810 kN ratings, 157 kN Pu and 57800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2244?",
        "a": "NU2244 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1260 kN, C0 1810 kN, Pu 157 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 57800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2244 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2244 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2244",
      "NU2244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU244",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU244 is the standard section of the NTN NU200 dimension series for a 220 mm shaft — 845 kN of basic dynamic capacity in a 37000 g, open bearing. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU244 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU244 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 220 mm (8.661 in) bore and 400 mm (15.748 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 65 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g NU244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU244 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 90.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU244?",
        "a": "NU244 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU244 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU244 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu244",
      "NU244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2244",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1260,
    "static_load_kN": 1810,
    "fatigue_load_limit_kN": 157,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 57800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2244 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1260 kN dynamic rating in the 220 mm bore. Numbering ties NUP2244 to its envelope: type code NUP, series NUP2200, 220 mm bore; the 400×108 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2244 designation when purchasing. Selection arithmetic: Pu 157 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.44 (1810/1260 kN) shows the high-static-capacity proportioning of this 220 mm bore. Housing and shaft fillets must clear the ring chamfers of NUP2244; an oversized radius locks the ring on its face and tilts the 108 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 57800 g NUP2244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP2244 with a deep-groove ball bearing on rating alone: line contact gives 1260 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 1260/1810 kN ratings, 157 kN Pu and 57800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2244?",
        "a": "NUP2244 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1260 kN, C0 1810 kN, Pu 157 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 57800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2244 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2244 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2244",
      "NUP2244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP244",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP244 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 220×400×65 mm ISO 15 envelope. Digit by digit, NUP244 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP244 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 94 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.28 (1080/845 kN) shows the high-static-capacity proportioning of this 220 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP244 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g NUP244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP244 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 220 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP244 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NUP244: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NUP244 with a deep-groove ball bearing on rating alone: line contact gives 845 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP244?",
        "a": "NUP244 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP244 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP244 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup244",
      "NUP244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2344",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2344",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1970,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 222,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N2344 denotes a 220×460×145 mm (8.661 × 18.11 × 5.709 in) cylindrical roller bearing in the N2300 family, a pressed sheet-steel cage. Numbering ties N2344 to its envelope: type code N, series N2300, 220 mm bore; the 460×145 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2344 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 114000 g for the 220×460×145 mm N2344 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2344.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g N2344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 120.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 145 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1970/2620 kN pair here belongs to N2344 as printed, not to the bare size.",
      "The 145 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "Do not replace N2344 with a deep-groove ball bearing on rating alone: line contact gives 1970 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1970/2620 kN ratings, 222 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2344?",
        "a": "N2344 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1970 kN, C0 2620 kN, Pu 222 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2344 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2344 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2344",
      "N2344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N344",
    "brand": "NTN",
    "manufacturer_designation": "NTN N344",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 220 mm shaft NTN supplies N344: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,400 r/min on grease and 1,600 r/min on oil. On the NTN nameplate N states which ring carries the ribs, which determines whether N344 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N344. Thermal planning around the 1,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,600 r/min for continuously high-duty 220 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g N344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N344 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace N344 with a deep-groove ball bearing on rating alone: line contact gives 1320 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace N344 with a deep-groove ball bearing on rating alone: line contact gives 1320 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N344?",
        "a": "N344 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N344 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N344 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n344",
      "N344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF344",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF344 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 220×460×88 mm ISO 15 envelope. Digit by digit, NF344 reads as NF (one rib on each ring), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1320 kN and C0 1570 kN (C0/C ≈ 1.19) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Mass 71700 g for the 220×460×88 mm NF344 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 220 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g NF344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NF344: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF344 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF344?",
        "a": "NF344 is an NTN NF single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF344 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF344 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf344",
      "NF344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2344",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1970,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 222,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2344 is the extra-wide (23) section of the NTN NJ2300 dimension series for a 220 mm shaft — 1970 kN of basic dynamic capacity in a 114000 g, open bearing. Digit by digit, NJ2344 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2344. Equivalent-load planning treats NJ2344 as a pure radial bearing: keep P below 1970 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2344 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NJ2344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ2344 with a deep-groove ball bearing on rating alone: line contact gives 1970 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 1970/2620 kN ratings, 222 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2344?",
        "a": "NJ2344 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1970 kN, C0 2620 kN, Pu 222 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2344 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2344 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2344",
      "NJ2344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ344",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ344 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1320 kN dynamic rating in the 220 mm bore. Numbering ties NJ344 to its envelope: type code NJ, series NJ300, 220 mm bore; the 460×88 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 1320 kN and C0 1570 kN (C0/C ≈ 1.19) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 6.0 kN-per-mm-bore figure (1320 kN over 220 mm) lets a NJ344 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g NJ344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 120.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 88 mm-wide cavity.",
      "Open NJ344 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 220 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ344 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ344?",
        "a": "NJ344 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ344 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ344 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ344-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj344",
      "NJ344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2344",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1970,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 222,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2344 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1970 kN dynamic rating in the 220 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2344 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 1,200 r/min grease and 1,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 220 mm bore. Rating life at 1970 kN C assumes clean oil and adequate film; the 222 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NU2344; an oversized radius locks the ring on its face and tilts the 145 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NU2344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 220 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1970/2620 kN pair here belongs to NU2344 as printed, not to the bare size.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 220 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "If the shaft must be located both ways, do not use NU2344 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1970/2620 kN ratings, 222 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2344?",
        "a": "NU2344 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1970 kN, C0 2620 kN, Pu 222 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2344 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2344 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2344-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×460×145 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2344",
      "NU2344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU344",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU344 denotes a 220×460×88 mm (8.661 × 18.11 × 3.465 in) cylindrical roller bearing in the NU300 family, a pressed sheet-steel cage. Digit by digit, NU344 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU344 designation when purchasing. Mass 71700 g for the 220×460×88 mm NU344 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g NU344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 120.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 88 mm-wide cavity.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 220 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×88 mm envelope matches.",
      "The 88 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU344?",
        "a": "NU344 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU344 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU344 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU344-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu344",
      "NU344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2344",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1970,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 222,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2344 appears as a 220 mm bore single-row cylindrical roller bearing (1970 kN C / 2620 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2344 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 284 mm and Ew 396 mm — the envelope inside the 220/460 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 220 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NUP2344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2344 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "The 1970/2620 kN ratings, 222 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2344?",
        "a": "NUP2344 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1970 kN, C0 2620 kN, Pu 222 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2344 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2344 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2344",
      "NUP2344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP344",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP344 on the 220×460 mm envelope, 88 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,400 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 220 mm, with 460 mm OD and 88 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 284 mm and Ew 396 mm — the envelope inside the 220/460 mm bore/OD where the rollers actually run. Speed ratio check: limiting 1,400 r/min is .88 of the 1,600 r/min oil value for NUP344; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP344 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g NUP344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Do not replace NUP344 with a deep-groove ball bearing on rating alone: line contact gives 1320 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 88 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 460×88 mm envelope matches.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP344?",
        "a": "NUP344 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP344 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP344 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup344",
      "NUP344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4948",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4948",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 680,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 126,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 16400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4948 is the extra-light (10/49) section of the NTN NN4900 dimension series for a 240 mm shaft — 680 kN of basic dynamic capacity in a 16400 g, open bearing. Digit by digit, NN4948 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NN4948 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 1,700 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 2,000 r/min for continuously high-duty 240 mm positions. Housing and shaft fillets must clear the ring chamfers of NN4948; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 16400 g NN4948 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4948 does not substitute a precision-class execution.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NN4948 with a deep-groove ball bearing on rating alone: line contact gives 680 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 680/1410 kN ratings, 126 kN Pu and 16400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4948 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4948?",
        "a": "NN4948 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 80 mm width (9.449 × 12.598 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 680 kN, C0 1410 kN, Pu 126 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 16400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4948 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4948 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4948?",
        "a": "NN4948 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4948?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 265 mm. The nominal bore/OD remain 240/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4948",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4948",
      "NN4948"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4948K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4948K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 680,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 126,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 15600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN4948K appears as a 240 mm bore single-row cylindrical roller bearing (680 kN C / 1410 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NN4948K to its envelope: type code NN, series NN4900, 240 mm bore; the 320×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 240 mm (9.449 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NN4948K; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 15600 g NN4948K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4948K skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 680/1410 kN pair here belongs to NN4948K as printed, not to the bare size.",
      "The 680/1410 kN ratings, 126 kN Pu and 15600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4948K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4948K?",
        "a": "NN4948K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 80 mm width (9.449 × 12.598 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 680 kN, C0 1410 kN, Pu 126 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 15600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4948K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4948K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4948K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4948K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4948 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4948K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 265 mm. The nominal bore/OD remain 240/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4948K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4948k",
      "NN4948K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4948K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4948K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 680,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 126,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 16400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NNU4948K on the 240×320 mm envelope, 80 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,700 r/min. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 320 mm OD and 80 mm width from the ISO 15 general plan. Double-row NNU precision cylindrical roller bearing: ribbed outer ring with a separable inner ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Equivalent-load planning treats NNU4948K as a pure radial bearing: keep P below 680 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 240 mm shaft.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 16400 g NNU4948K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NNU4948K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 680/1410 kN pair here belongs to NNU4948K as printed, not to the bare size.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NNU4948K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The 680/1410 kN ratings, 126 kN Pu and 16400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4948K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4948K?",
        "a": "NNU4948K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 80 mm width (9.449 × 12.598 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 680 kN, C0 1410 kN, Pu 126 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 16400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4948K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4948K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4948K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4948K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4948 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4948K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 265 mm. The nominal bore/OD remain 240/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4948K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4948k",
      "NNU4948K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1048",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1048",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 19300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N1048 denotes a 240×360×56 mm (9.449 × 14.173 × 2.205 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 240 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1048 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 72 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.40 (820/585 kN) shows the high-static-capacity proportioning of this 240 mm bore. Heat the inner ring to max 120 °C for the 240 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 19300 g N1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "Do not replace N1048 with a deep-groove ball bearing on rating alone: line contact gives 585 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1048 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace N1048 with a deep-groove ball bearing on rating alone: line contact gives 585 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1048?",
        "a": "N1048 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 56 mm width (9.449 × 14.173 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 820 kN, Pu 72 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 19300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1048 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1048 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1048?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 330 mm. The nominal bore/OD remain 240/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1048",
      "N1048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1048",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1048",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 19300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1048 is the extra-light (10/49) section of the NTN NJ1000 dimension series for a 240 mm shaft — 585 kN of basic dynamic capacity in a 19300 g, open bearing. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1048 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1048. Speed ratio check: limiting 1,800 r/min is .86 of the 2,100 r/min oil value for NJ1048; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 19300 g NJ1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,800 r/min and oil 2,100 r/min are different limits for NJ1048: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/820 kN pair here belongs to NJ1048 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1048?",
        "a": "NJ1048 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 56 mm width (9.449 × 14.173 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 820 kN, Pu 72 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 19300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1048 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1048 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1048?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 330 mm. The nominal bore/OD remain 240/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1048",
      "NJ1048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3048",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3048",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 945,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 140,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 32800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3048 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 945 kN dynamic rating in the 240 mm bore. Numbering ties NN3048 to its envelope: type code NN, series NN3000, 240 mm bore; the 360×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3048 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 945 kN C assumes clean oil and adequate film; the 140 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 32800 g NN3048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 60.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NN3048 with a deep-groove ball bearing on rating alone: line contact gives 945 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 945/1600 kN ratings, 140 kN Pu and 32800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3048?",
        "a": "NN3048 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 92 mm width (9.449 × 14.173 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 945 kN, C0 1600 kN, Pu 140 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 32800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3048 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3048?",
        "a": "NN3048 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3048?",
        "a": "NTN rates NN3048 at 1,600 r/min with grease and 1,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3048",
      "NN3048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3048K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3048K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 945,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 140,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 31600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3048K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 945 kN dynamic rating in the 240 mm bore. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 240 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NN3048K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for NN3048K; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 31600 g NN3048K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN3048K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 92 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The K tapered bore of NN3048K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Do not replace NN3048K with a deep-groove ball bearing on rating alone: line contact gives 945 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 945/1600 kN ratings, 140 kN Pu and 31600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3048K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3048K?",
        "a": "NN3048K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 92 mm width (9.449 × 14.173 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 945 kN, C0 1600 kN, Pu 140 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 31600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3048K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3048K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3048K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3048K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3048 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3048K?",
        "a": "NTN rates NN3048K at 1,600 r/min with grease and 1,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3048K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3048k",
      "NN3048K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1048",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1048",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 19300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1048 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 585 kN dynamic rating in the 240 mm bore. Numbering ties NU1048 to its envelope: type code NU, series NU1000, 240 mm bore; the 360×56 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,800 r/min grease and 2,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 240 mm bore. The 240 mm (9.449 in) bore and 360 mm (14.173 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 56 mm-wide ring. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 19300 g NU1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU1048 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Do not replace NU1048 with a deep-groove ball bearing on rating alone: line contact gives 585 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/820 kN pair here belongs to NU1048 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NU1048 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1048?",
        "a": "NU1048 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 56 mm width (9.449 × 14.173 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 820 kN, Pu 72 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 19300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1048 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1048 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1048?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 330 mm. The nominal bore/OD remain 240/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1048-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×360×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1048",
      "NU1048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1048",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1048",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 19300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1048 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 585 kN dynamic rating in the 240 mm bore. Numbering ties NUP1048 to its envelope: type code NUP, series NUP1000, 240 mm bore; the 360×56 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP1048 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1048.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 19300 g NUP1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP1048 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "If the shaft must be located both ways, do not use NUP1048 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NUP1048 with a deep-groove ball bearing on rating alone: line contact gives 585 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1048?",
        "a": "NUP1048 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 56 mm width (9.449 × 14.173 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 820 kN, Pu 72 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 19300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1048 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1048 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1048?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 330 mm. The nominal bore/OD remain 240/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1048",
      "NUP1048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2248",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2248",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 78400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2248 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 240×440×120 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 440 mm OD and 120 mm width from the ISO 15 general plan. With C 1590 kN and C0 2320 kN (C0/C ≈ 1.46) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Selection arithmetic: Pu 196 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.46 (2320/1590 kN) shows the high-static-capacity proportioning of this 240 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 78400 g N2248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2320 kN pair here belongs to N2248 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2320 kN pair here belongs to N2248 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use N2248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2248 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "The 1590/2320 kN ratings, 196 kN Pu and 78400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2248?",
        "a": "N2248 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2320 kN, Pu 196 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 78400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2248 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2248 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2248",
      "N2248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N248",
    "brand": "NTN",
    "manufacturer_designation": "NTN N248",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N248 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1040 kN dynamic rating in the 240 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 240 mm (00–03 use the 10/12/15/17 exception table). The 72 mm width and 100.0 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,700 r/min for continuously high-duty 240 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g N248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 240 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 440×72 mm envelope matches.",
      "Do not replace N248 with a deep-groove ball bearing on rating alone: line contact gives 1040 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "Open N248 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N248?",
        "a": "N248 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N248 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N248 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n248",
      "N248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF248",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NF248 on the 240×440 mm envelope, 72 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,500 r/min. Numbering ties NF248 to its envelope: type code NF, series NF200, 240 mm bore; the 440×72 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,500 r/min grease and 1,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 240 mm bore. Mass 49200 g for the 240×440×72 mm NF248 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 240 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g NF248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 72 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for NF248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for NF248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NF248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF248?",
        "a": "NF248 is an NTN NF single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF248 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF248 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf248",
      "NF248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2248",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 78400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ2248 denotes a 240×440×120 mm (9.449 × 17.323 × 4.724 in) cylindrical roller bearing in the NJ2200 family, a pressed sheet-steel cage. Numbering ties NJ2248 to its envelope: type code NJ, series NJ2200, 240 mm bore; the 440×120 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 120 mm width and 100.0 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NJ2248 as a pure radial bearing: keep P below 1590 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2248 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 78400 g NJ2248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2248 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2320 kN pair here belongs to NJ2248 as printed, not to the bare size.",
      "Open NJ2248 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 1590/2320 kN ratings, 196 kN Pu and 78400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2248?",
        "a": "NJ2248 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2320 kN, Pu 196 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 78400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2248 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2248 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2248",
      "NJ2248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ248",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ248 appears as a 240 mm bore single-row cylindrical roller bearing (1040 kN C / 1340 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NJ248 to its envelope: type code NJ, series NJ200, 240 mm bore; the 440×72 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 72 mm width and 100.0 mm section put the NJ200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,700 r/min for continuously high-duty 240 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ248 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g NJ248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for NJ248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 100.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 72 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NJ248 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ248?",
        "a": "NJ248 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ248 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ248 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj248",
      "NJ248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2248",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 78400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2248 appears as a 240 mm bore single-row cylindrical roller bearing (1590 kN C / 2320 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2248 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. At 1,600 r/min with oil versus 1,300 r/min with grease (a 300 r/min band), lubrication choice for NU2248 is a thermal decision, not just a sealing one. Speed ratio check: limiting 1,300 r/min is .81 of the 1,600 r/min oil value for NU2248; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 240 mm shaft.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 78400 g NU2248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU2248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2320 kN pair here belongs to NU2248 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,300 r/min and oil 1,600 r/min are different limits for NU2248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1590/2320 kN ratings, 196 kN Pu and 78400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2248?",
        "a": "NU2248 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2320 kN, Pu 196 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 78400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2248 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2248 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2248",
      "NU2248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU248",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU248 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 240×440×72 mm ISO 15 envelope. Digit by digit, NU248 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Rating life at 1040 kN C assumes clean oil and adequate film; the 113 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU248 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g NU248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for NU248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 100.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 72 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1040/1340 kN pair here belongs to NU248 as printed, not to the bare size.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU248?",
        "a": "NU248 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU248 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU248 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu248",
      "NU248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2248",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 78400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2248 is the wide (22) section of the NTN NUP2200 dimension series for a 240 mm shaft — 1590 kN of basic dynamic capacity in a 78400 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2248 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2248 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 78400 g for the 240×440×120 mm NUP2248 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 240 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 78400 g NUP2248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP2248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 240 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 440×120 mm envelope matches.",
      "The 100.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 120 mm-wide cavity.",
      "Do not replace NUP2248 with a deep-groove ball bearing on rating alone: line contact gives 1590 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1590/2320 kN ratings, 196 kN Pu and 78400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2248?",
        "a": "NUP2248 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2320 kN, Pu 196 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 78400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2248 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2248 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2248",
      "NUP2248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP248",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 240 mm shaft NTN supplies NUP248: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,500 r/min on grease and 1,700 r/min on oil. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 440 mm OD and 72 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP248 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 49200 g for the 240×440×72 mm NUP248 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g NUP248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP248 with a deep-groove ball bearing on rating alone: line contact gives 1040 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NUP248 with a deep-groove ball bearing on rating alone: line contact gives 1040 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NUP248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP248?",
        "a": "NUP248 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP248 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP248 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup248",
      "NUP248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2348",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2348",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2330,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 262,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N2348 on the 240×500 mm envelope, 155 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. On the NTN nameplate N states which ring carries the ribs, which determines whether N2348 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2348 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 9.7 kN-per-mm-bore figure (2330 kN over 240 mm) lets a N2348 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 144000 g N2348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 155 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The 130.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 155 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2330/3200 kN ratings, 262 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2348?",
        "a": "N2348 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2330 kN, C0 3200 kN, Pu 262 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 144000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2348 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2348 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2348",
      "N2348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N348",
    "brand": "NTN",
    "manufacturer_designation": "NTN N348",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N348 appears as a 240 mm bore single-row cylindrical roller bearing (1590 kN C / 1950 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N348 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,300 r/min grease and 1,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 240 mm bore. Selection arithmetic: Pu 160 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.23 (1950/1590 kN) shows the high-static-capacity proportioning of this 240 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N348 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g N348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for N348: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for N348: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for N348: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use N348 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N348?",
        "a": "N348 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N348 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N348 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n348",
      "N348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF348",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 240 mm shaft NTN supplies NF348: one integral rib on each ring; the open execution is rated 1,300 r/min on grease and 1,500 r/min on oil. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 500 mm OD and 95 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF348. The 6.6 kN-per-mm-bore figure (1590 kN over 240 mm) lets a NF348 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF348.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g NF348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 240 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 500×95 mm envelope matches.",
      "If the shaft must be located both ways, do not use NF348 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF348?",
        "a": "NF348 is an NTN NF single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF348 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF348 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf348",
      "NF348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2348",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2330,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 262,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2348 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 240×500×155 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 500 mm OD and 155 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,100 r/min grease and 1,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 240 mm bore. The 240 mm (9.449 in) bore and 500 mm (19.685 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 155 mm-wide ring. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 144000 g NJ2348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ2348 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 240 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 500×155 mm envelope matches.",
      "Open NJ2348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "If the shaft must be located both ways, do not use NJ2348 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 2330/3200 kN ratings, 262 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2348?",
        "a": "NJ2348 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2330 kN, C0 3200 kN, Pu 262 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 144000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2348 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2348 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2348",
      "NJ2348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ348",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ348 is the standard section of the NTN NJ300 dimension series for a 240 mm shaft — 1590 kN of basic dynamic capacity in a 91300 g, open bearing. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ348 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ348. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ348 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g NJ348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ348 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ348?",
        "a": "NJ348 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ348 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ348 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ348-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj348",
      "NJ348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2348",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2330,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 262,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2348 is the extra-wide (23) section of the NTN NU2300 dimension series for a 240 mm shaft — 2330 kN of basic dynamic capacity in a 144000 g, open bearing. Digit by digit, NU2348 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 155 mm width and 130.0 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,300 r/min for continuously high-duty 240 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 240 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 144000 g NU2348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2348 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "The 155 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "Open NU2348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Open NU2348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 2330/3200 kN ratings, 262 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2348?",
        "a": "NU2348 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2330 kN, C0 3200 kN, Pu 262 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 144000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2348 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2348 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2348-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×500×155 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2348",
      "NU2348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU348",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU348 on the 240×500 mm envelope, 95 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,300 r/min. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 500 mm OD and 95 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU348 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 6.6 kN-per-mm-bore figure (1590 kN over 240 mm) lets a NU348 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU348 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g NU348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "Open NU348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Do not replace NU348 with a deep-groove ball bearing on rating alone: line contact gives 1590 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU348?",
        "a": "NU348 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU348 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU348 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU348-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu348",
      "NU348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2348",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2330,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 262,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2348 denotes a 240×500×155 mm (9.449 × 19.685 × 6.102 in) cylindrical roller bearing in the NUP2300 family, a pressed sheet-steel cage. Digit by digit, NUP2348 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2348 designation when purchasing. Speed ratio check: limiting 1,100 r/min is .85 of the 1,300 r/min oil value for NUP2348; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 240 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 144000 g NUP2348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2348 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Open NUP2348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Do not replace NUP2348 with a deep-groove ball bearing on rating alone: line contact gives 2330 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 155 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The 2330/3200 kN ratings, 262 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2348?",
        "a": "NUP2348 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2330 kN, C0 3200 kN, Pu 262 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 144000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2348 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2348 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2348",
      "NUP2348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP348",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP348 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1590 kN dynamic rating in the 240 mm bore. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 240 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP348 designation when purchasing. Equivalent-load planning treats NUP348 as a pure radial bearing: keep P below 1590 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g NUP348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 240 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 500×95 mm envelope matches.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for NUP348: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 130.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 95 mm-wide cavity.",
      "The 95 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP348?",
        "a": "NUP348 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP348 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP348 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup348",
      "NUP348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4952",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4952",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1800,
    "weight_g": 28300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4952 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 260×360×100 mm ISO 15 envelope. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4952 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Housing and shaft fillets must clear the ring chamfers of NN4952; an oversized radius locks the ring on its face and tilts the 100 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 28300 g NN4952 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,600 r/min and oil 1,800 r/min are different limits for NN4952: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 50.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 260 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 360×100 mm envelope matches.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 1000/2070 kN ratings, 179 kN Pu and 28300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4952 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4952?",
        "a": "NN4952 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 100 mm width (10.236 × 14.173 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 2070 kN, Pu 179 kN, grease limiting speed 1,600 r/min, oil 1,800 r/min, mass about 28300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4952 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4952 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4952?",
        "a": "NN4952 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4952?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 292 mm. The nominal bore/OD remain 260/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4952",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4952",
      "NN4952"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4952K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4952K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1800,
    "weight_g": 27000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4952K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1000 kN dynamic rating in the 260 mm bore. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 260 mm, with 360 mm OD and 100 mm width from the ISO 15 general plan. At 1,800 r/min with oil versus 1,600 r/min with grease (a 200 r/min band), lubrication choice for NN4952K is a thermal decision, not just a sealing one. Speed ratio check: limiting 1,600 r/min is .89 of the 1,800 r/min oil value for NN4952K; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN4952K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 27000 g NN4952K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1000/2070 kN pair here belongs to NN4952K as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1000/2070 kN pair here belongs to NN4952K as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,600 r/min and oil 1,800 r/min are different limits for NN4952K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1000/2070 kN ratings, 179 kN Pu and 27000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4952K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4952K?",
        "a": "NN4952K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 100 mm width (10.236 × 14.173 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 2070 kN, Pu 179 kN, grease limiting speed 1,600 r/min, oil 1,800 r/min, mass about 27000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4952K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4952K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4952K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4952K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4952 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4952K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 292 mm. The nominal bore/OD remain 260/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4952K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4952k",
      "NN4952K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4952K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4952K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1800,
    "weight_g": 28300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4952K is an NTN NNU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 260×360×100 mm ISO 15 envelope. On the NTN nameplate NNU states which ring carries the ribs, which determines whether NNU4952K floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 1,600 r/min grease and 1,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NNU arrangements. On NNU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 28300 g NNU4952K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 50.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NNU4952K with a deep-groove ball bearing on rating alone: line contact gives 1000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The K tapered bore of NNU4952K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The 1000/2070 kN ratings, 179 kN Pu and 28300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4952K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4952K?",
        "a": "NNU4952K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 100 mm width (10.236 × 14.173 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 2070 kN, Pu 179 kN, grease limiting speed 1,600 r/min, oil 1,800 r/min, mass about 28300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4952K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4952K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4952K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4952K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4952 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4952K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 292 mm. The nominal bore/OD remain 260/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4952K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4952k",
      "NNU4952K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1052",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1052",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 715,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 85,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N1052 on the 260×400 mm envelope, 65 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,600 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 260 mm, with 400 mm OD and 65 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1052 designation when purchasing. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for N1052; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 260 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 28700 g N1052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "Open N1052 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "Do not replace N1052 with a deep-groove ball bearing on rating alone: line contact gives 715 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 715/1000 kN ratings, 85 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1052?",
        "a": "N1052 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 65 mm width (10.236 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 715 kN, C0 1000 kN, Pu 85 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1052 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1052 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1052?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 296 mm, Ew 364 mm. The nominal bore/OD remain 260/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1052",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1052",
      "N1052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1052",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1052",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 715,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 85,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1052 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 260×400×65 mm ISO 15 envelope. Numbering ties NJ1052 to its envelope: type code NJ, series NJ1000, 260 mm bore; the 400×65 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 715 kN and C0 1000 kN (C0/C ≈ 1.40) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,900 r/min for continuously high-duty 260 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 260 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 28700 g NJ1052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ1052 with a deep-groove ball bearing on rating alone: line contact gives 715 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NJ1052 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1052 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 715/1000 kN ratings, 85 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1052?",
        "a": "NJ1052 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 65 mm width (10.236 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 715 kN, C0 1000 kN, Pu 85 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1052 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1052 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1052?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 296 mm, Ew 364 mm. The nominal bore/OD remain 260/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1052-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1052",
      "NJ1052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3052",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3052",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1180,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 47400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3052 is the standard section of the NTN NN3000 dimension series for a 260 mm shaft — 1180 kN of basic dynamic capacity in a 47400 g, open bearing. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. The 4.5 kN-per-mm-bore figure (1180 kN over 260 mm) lets a NN3052 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 47400 g NN3052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 104 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 70.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 104 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 260 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 400×104 mm envelope matches.",
      "The 104 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 1180/1990 kN ratings, 170 kN Pu and 47400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3052?",
        "a": "NN3052 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 104 mm width (10.236 × 15.748 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 1990 kN, Pu 170 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 47400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3052 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3052?",
        "a": "NN3052 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3052?",
        "a": "NTN rates NN3052 at 1,500 r/min with grease and 1,700 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3052",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3052",
      "NN3052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3052K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3052K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1180,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 45800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 260 mm shaft NTN supplies NN3052K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,500 r/min on grease and 1,700 r/min on oil. Digit by digit, NN3052K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 70.0 mm radial section ((400−260)/2) frames the roller complement; capacity per millimetre of bore is about 4.5 kN/mm before application factors. Mass 45800 g for the 260×400×104 mm NN3052K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3052K.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 45800 g NN3052K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 104 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 260 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 400×104 mm envelope matches.",
      "The 104 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 70.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 104 mm-wide cavity.",
      "The 1180/1990 kN ratings, 170 kN Pu and 45800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3052K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3052K?",
        "a": "NN3052K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 104 mm width (10.236 × 15.748 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 1990 kN, Pu 170 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 45800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3052K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3052K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3052K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3052K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3052 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3052K?",
        "a": "NTN rates NN3052K at 1,500 r/min with grease and 1,700 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3052K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3052k",
      "NN3052K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1052",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1052",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 715,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 85,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1052 is the extra-light (10/49) section of the NTN NU1000 dimension series for a 260 mm shaft — 715 kN of basic dynamic capacity in a 28700 g, open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1052. Mass 28700 g for the 260×400×65 mm NU1052 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 28700 g NU1052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 260 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 400×65 mm envelope matches.",
      "Open NU1052 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The 715/1000 kN ratings, 85 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1052?",
        "a": "NU1052 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 65 mm width (10.236 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 715 kN, C0 1000 kN, Pu 85 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1052 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1052 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1052?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 296 mm, Ew 364 mm. The nominal bore/OD remain 260/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1052-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1052",
      "NU1052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1052",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1052",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 715,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 85,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1052 is the extra-light (10/49) section of the NTN NUP1000 dimension series for a 260 mm shaft — 715 kN of basic dynamic capacity in a 28700 g, open bearing. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1052 designation when purchasing. Rating life at 715 kN C assumes clean oil and adequate film; the 85 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1052.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 28700 g NUP1052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 400×65 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP1052 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 715/1000 kN pair here belongs to NUP1052 as printed, not to the bare size.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 715/1000 kN ratings, 85 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1052?",
        "a": "NUP1052 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 65 mm width (10.236 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 715 kN, C0 1000 kN, Pu 85 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1052 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1052 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1052?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 296 mm, Ew 364 mm. The nominal bore/OD remain 260/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1052",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1052",
      "NUP1052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2252",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2252",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1980,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 241,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 260 mm shaft NTN supplies N2252: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,200 r/min on grease and 1,400 r/min on oil. Digit by digit, N2252 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 1,200 r/min is .86 of the 1,400 r/min oil value for N2252; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 260 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 102000 g N2252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N2252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for N2252: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1980/2930 kN pair here belongs to N2252 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1980/2930 kN pair here belongs to N2252 as printed, not to the bare size.",
      "The 1980/2930 kN ratings, 241 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2252?",
        "a": "N2252 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1980 kN, C0 2930 kN, Pu 241 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 102000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2252 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2252 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2252",
      "N2252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N252",
    "brand": "NTN",
    "manufacturer_designation": "NTN N252",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N252 is the standard section of the NTN N200 dimension series for a 260 mm shaft — 1270 kN of basic dynamic capacity in a 65600 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 260 mm, with 480 mm OD and 80 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,300 r/min grease and 1,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 260 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g N252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open N252 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use N252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N252?",
        "a": "N252 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N252 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N252 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n252",
      "N252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF252",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF252 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1270 kN dynamic rating in the 260 mm bore. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF252. Equivalent-load planning treats NF252 as a pure radial bearing: keep P below 1270 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 260 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g NF252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1270/1660 kN pair here belongs to NF252 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF252 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NF252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF252?",
        "a": "NF252 is an NTN NF single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF252 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF252 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf252",
      "NF252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2252",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1980,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 241,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ2252 on the 260×480 mm envelope, 130 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,200 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,200 r/min grease and 1,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. Selection arithmetic: Pu 241 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.48 (2930/1980 kN) shows the high-static-capacity proportioning of this 260 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2252 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 102000 g NJ2252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 480×130 mm envelope matches.",
      "The 110.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 130 mm-wide cavity.",
      "The 130 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "If the shaft must be located both ways, do not use NJ2252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1980/2930 kN ratings, 241 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2252?",
        "a": "NJ2252 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1980 kN, C0 2930 kN, Pu 241 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 102000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2252 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2252 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2252-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×480×130 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2252",
      "NJ2252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ252",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ252 denotes a 260×480×80 mm (10.236 × 18.898 × 3.15 in) cylindrical roller bearing in the NJ200 family, a pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,300 r/min grease and 1,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ252 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g NJ252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ252 with a deep-groove ball bearing on rating alone: line contact gives 1270 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1270/1660 kN pair here belongs to NJ252 as printed, not to the bare size.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 480×80 mm envelope matches.",
      "If the shaft must be located both ways, do not use NJ252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ252?",
        "a": "NJ252 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ252 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ252 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ252-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj252",
      "NJ252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2252",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1980,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 241,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2252 denotes a 260×480×130 mm (10.236 × 18.898 × 5.118 in) cylindrical roller bearing in the NU2200 family, a pressed sheet-steel cage. Numbering ties NU2252 to its envelope: type code NU, series NU2200, 260 mm bore; the 480×130 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 110.0 mm radial section ((480−260)/2) frames the roller complement; capacity per millimetre of bore is about 7.6 kN/mm before application factors. Thermal planning around the 1,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,400 r/min for continuously high-duty 260 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 260 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 102000 g NU2252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NU2252: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NU2252: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 110.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 130 mm-wide cavity.",
      "The 1980/2930 kN ratings, 241 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2252?",
        "a": "NU2252 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1980 kN, C0 2930 kN, Pu 241 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 102000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2252 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2252 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2252-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×480×130 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2252",
      "NU2252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU252",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 260 mm shaft NTN supplies NU252: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,300 r/min on grease and 1,600 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU252 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU252 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 4.9 kN-per-mm-bore figure (1270 kN over 260 mm) lets a NU252 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU252 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g NU252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU252 with a deep-groove ball bearing on rating alone: line contact gives 1270 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1270/1660 kN pair here belongs to NU252 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU252?",
        "a": "NU252 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU252 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU252 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU252-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu252",
      "NU252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2252",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1980,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 241,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2252 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 260×480×130 mm ISO 15 envelope. Numbering ties NUP2252 to its envelope: type code NUP, series NUP2200, 260 mm bore; the 480×130 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2252 designation when purchasing. Equivalent-load planning treats NUP2252 as a pure radial bearing: keep P below 1980 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 260 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 102000 g NUP2252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NUP2252: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "The 130 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 1980/2930 kN ratings, 241 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2252?",
        "a": "NUP2252 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1980 kN, C0 2930 kN, Pu 241 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 102000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2252 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2252 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2252",
      "NUP2252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP252",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP252 appears as a 260 mm bore single-row cylindrical roller bearing (1270 kN C / 1660 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NUP252 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP252 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NUP252 as a pure radial bearing: keep P below 1270 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g NUP252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP252 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "Open NUP252 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1270/1660 kN pair here belongs to NUP252 as printed, not to the bare size.",
      "Do not replace NUP252 with a deep-groove ball bearing on rating alone: line contact gives 1270 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP252?",
        "a": "NUP252 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP252 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP252 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP252-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup252",
      "NUP252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2352",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2352",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 289,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2352 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 2600 kN dynamic rating in the 260 mm bore. Numbering ties N2352 to its envelope: type code N, series N2300, 260 mm bore; the 540×165 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2352 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 260 mm (10.236 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 165 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 260 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 178000 g N2352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use N2352 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "Do not replace N2352 with a deep-groove ball bearing on rating alone: line contact gives 2600 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2600/3600 kN ratings, 289 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2352?",
        "a": "N2352 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3600 kN, Pu 289 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 178000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2352 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2352 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2352",
      "N2352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N352",
    "brand": "NTN",
    "manufacturer_designation": "NTN N352",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N352 denotes a 260×540×102 mm (10.236 × 21.26 × 4.016 in) cylindrical roller bearing in the N300 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N352 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N352. Speed ratio check: limiting 1,200 r/min is .86 of the 1,400 r/min oil value for N352; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N352 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g N352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace N352 with a deep-groove ball bearing on rating alone: line contact gives 1790 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use N352 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N352?",
        "a": "N352 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N352 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N352 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n352",
      "N352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF352",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF352 appears as a 260 mm bore single-row cylindrical roller bearing (1790 kN C / 2230 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NF352 reads as NF (one rib on each ring), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1790 kN and C0 2230 kN (C0/C ≈ 1.25) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. The 260 mm (10.236 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 102 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF352.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NF352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NF352 with a deep-groove ball bearing on rating alone: line contact gives 1790 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 260 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 540×102 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF352?",
        "a": "NF352 is an NTN NF single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF352 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF352 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf352",
      "NF352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2352",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 289,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 260 mm shaft NTN supplies NJ2352: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,000 r/min on grease and 1,200 r/min on oil. Digit by digit, NJ2352 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2352. Mass 178000 g for the 260×540×165 mm NJ2352 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 178000 g NJ2352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,000 r/min and oil 1,200 r/min are different limits for NJ2352: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2352 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 2600/3600 kN ratings, 289 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2352?",
        "a": "NJ2352 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3600 kN, Pu 289 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 178000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2352 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2352 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2352-ECMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×540×165 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2352",
      "NJ2352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ352",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ352 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 260×540×102 mm ISO 15 envelope. Numbering ties NJ352 to its envelope: type code NJ, series NJ300, 260 mm bore; the 540×102 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 1790 kN and C0 2230 kN (C0/C ≈ 1.25) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Rating life at 1790 kN C assumes clean oil and adequate film; the 180 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ352 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NJ352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 540×102 mm envelope matches.",
      "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "Do not replace NJ352 with a deep-groove ball bearing on rating alone: line contact gives 1790 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ352?",
        "a": "NJ352 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ352 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ352 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj352",
      "NJ352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2352",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 289,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2352 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 260×540×165 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2352 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 1,000 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 260 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 178000 g NU2352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU2352 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "If the shaft must be located both ways, do not use NU2352 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2352 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NU2352 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 2600/3600 kN ratings, 289 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2352?",
        "a": "NU2352 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3600 kN, Pu 289 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 178000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2352 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2352 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2352-ECMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×540×165 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2352",
      "NU2352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU352",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU352 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1790 kN dynamic rating in the 260 mm bore. Digit by digit, NU352 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU352 designation when purchasing. The 260 mm (10.236 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 102 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU352 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NU352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 260 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×102 mm envelope matches.",
      "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU352?",
        "a": "NU352 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU352 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU352 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU352-ECMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×540×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu352",
      "NU352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2352",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 289,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2352 on the 260×540 mm envelope, 165 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,000 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2352 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 336 mm and Ew 464 mm — the envelope inside the 260/540 mm bore/OD where the rollers actually run. Thermal planning around the 1,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,200 r/min for continuously high-duty 260 mm positions. Heat the inner ring to max 120 °C for the 260 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 178000 g NUP2352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2352 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 1,000 r/min and oil 1,200 r/min are different limits for NUP2352: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×165 mm envelope matches.",
      "The 2600/3600 kN ratings, 289 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2352?",
        "a": "NUP2352 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3600 kN, Pu 289 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 178000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2352 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2352 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2352",
      "NUP2352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP352",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP352 is the standard section of the NTN NUP300 dimension series for a 260 mm shaft — 1790 kN of basic dynamic capacity in a 114000 g, open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 260 mm, with 540 mm OD and 102 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 336 mm and Ew 464 mm — the envelope inside the 260/540 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 180 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.25 (2230/1790 kN) shows the high-static-capacity proportioning of this 260 mm bore. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NUP352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×102 mm envelope matches.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP352?",
        "a": "NUP352 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP352 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP352 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup352",
      "NUP352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4956",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4956",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1030,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 187,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 30200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NN4956: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,400 r/min on grease and 1,700 r/min on oil. Digit by digit, NN4956 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NN4956 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,400 r/min is .82 of the 1,700 r/min oil value for NN4956; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 280 mm shaft.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 30200 g NN4956 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1030/2200 kN pair here belongs to NN4956 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Open NN4956 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Do not replace NN4956 with a deep-groove ball bearing on rating alone: line contact gives 1030 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1030/2200 kN ratings, 187 kN Pu and 30200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4956 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4956?",
        "a": "NN4956 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 100 mm width (11.024 × 14.961 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1030 kN, C0 2200 kN, Pu 187 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 30200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4956 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4956 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4956?",
        "a": "NN4956 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4956?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 312 mm. The nominal bore/OD remain 280/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4956",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4956",
      "NN4956"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4956K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4956K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1030,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 187,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 28800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NN4956K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,400 r/min on grease and 1,700 r/min on oil. Numbering ties NN4956K to its envelope: type code NN, series NN4900, 280 mm bore; the 380×100 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Thermal planning around the 1,400 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,700 r/min for continuously high-duty 280 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 280 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 28800 g NN4956K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN4956K with a deep-groove ball bearing on rating alone: line contact gives 1030 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,400 r/min and oil 1,700 r/min are different limits for NN4956K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 50.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "The 1030/2200 kN ratings, 187 kN Pu and 28800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4956K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4956K?",
        "a": "NN4956K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 100 mm width (11.024 × 14.961 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1030 kN, C0 2200 kN, Pu 187 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 28800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4956K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4956K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4956K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4956K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4956 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4956K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 312 mm. The nominal bore/OD remain 280/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4956K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4956k",
      "NN4956K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4956K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4956K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1030,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 187,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 30200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NNU4956K denotes a 280×380×100 mm (11.024 × 14.961 × 3.937 in) cylindrical roller bearing in the NNU4900 family, a machined or stamped steel cage per the precision execution. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 380 mm OD and 100 mm width from the ISO 15 general plan. The 50.0 mm radial section ((380−280)/2) frames the roller complement; capacity per millimetre of bore is about 3.7 kN/mm before application factors. Rating life at 1030 kN C assumes clean oil and adequate film; the 187 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NNU4956K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 30200 g NNU4956K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The K tapered bore of NNU4956K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The 50.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4956K skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 50.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The 1030/2200 kN ratings, 187 kN Pu and 30200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4956K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4956K?",
        "a": "NNU4956K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 100 mm width (11.024 × 14.961 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1030 kN, C0 2200 kN, Pu 187 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 30200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4956K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4956K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4956K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4956K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4956 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4956K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 312 mm. The nominal bore/OD remain 280/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4956K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4956k",
      "NNU4956K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1056",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1056",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 730,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 88,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 30400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1056 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 730 kN dynamic rating in the 280 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 280 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1056 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats N1056 as a pure radial bearing: keep P below 730 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N1056.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 30400 g N1056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1056 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,500 r/min and oil 1,800 r/min are different limits for N1056: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace N1056 with a deep-groove ball bearing on rating alone: line contact gives 730 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 730/1050 kN ratings, 88 kN Pu and 30400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1056?",
        "a": "N1056 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 65 mm width (11.024 × 16.535 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 730 kN, C0 1050 kN, Pu 88 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 30400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1056 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1056 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1056?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 316 mm, Ew 384 mm. The nominal bore/OD remain 280/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1056",
      "N1056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1056",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1056",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 730,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 88,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 30400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NJ1056: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,500 r/min on grease and 1,800 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1056 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1056. Selection arithmetic: Pu 88 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.44 (1050/730 kN) shows the high-static-capacity proportioning of this 280 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ1056 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 30400 g NJ1056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ1056 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 730/1050 kN pair here belongs to NJ1056 as printed, not to the bare size.",
      "The 70.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "The 730/1050 kN ratings, 88 kN Pu and 30400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1056?",
        "a": "NJ1056 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 65 mm width (11.024 × 16.535 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 730 kN, C0 1050 kN, Pu 88 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 30400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1056 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1056 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1056?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 316 mm, Ew 384 mm. The nominal bore/OD remain 280/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1056",
      "NJ1056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3056",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3056",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1200,
    "static_load_kN": 2080,
    "fatigue_load_limit_kN": 174,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 51100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3056 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 280×420×106 mm ISO 15 envelope. Numbering ties NN3056 to its envelope: type code NN, series NN3000, 280 mm bore; the 420×106 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3056 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Housing and shaft fillets must clear the ring chamfers of NN3056; an oversized radius locks the ring on its face and tilts the 106 mm-wide seat.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 51100 g NN3056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "Open NN3056 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Do not replace NN3056 with a deep-groove ball bearing on rating alone: line contact gives 1200 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1200/2080 kN ratings, 174 kN Pu and 51100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3056?",
        "a": "NN3056 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 106 mm width (11.024 × 16.535 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1200 kN, C0 2080 kN, Pu 174 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 51100 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3056 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3056?",
        "a": "NN3056 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3056?",
        "a": "NTN rates NN3056 at 1,300 r/min with grease and 1,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3056",
      "NN3056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3056K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3056K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1200,
    "static_load_kN": 2080,
    "fatigue_load_limit_kN": 174,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 49300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN3056K on the 280×420 mm envelope, 106 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,300 r/min. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 280 mm (00–03 use the 10/12/15/17 exception table). The roller-set pitch sits inside the 70.0 mm radial section between the 280 mm bore and 420 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Equivalent-load planning treats NN3056K as a pure radial bearing: keep P below 1200 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 280 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 49300 g NN3056K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The K tapered bore of NN3056K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1200/2080 kN pair here belongs to NN3056K as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 280 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 420×106 mm envelope matches.",
      "The 1200/2080 kN ratings, 174 kN Pu and 49300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3056K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3056K?",
        "a": "NN3056K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 106 mm width (11.024 × 16.535 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1200 kN, C0 2080 kN, Pu 174 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 49300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3056K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3056K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3056K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3056K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3056 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3056K?",
        "a": "NTN rates NN3056K at 1,300 r/min with grease and 1,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3056K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3056k",
      "NN3056K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1056",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1056",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 730,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 88,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 30400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1056 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 280×420×65 mm ISO 15 envelope. Numbering ties NU1056 to its envelope: type code NU, series NU1000, 280 mm bore; the 420×65 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,500 r/min grease and 1,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 280 mm bore. The 2.6 kN-per-mm-bore figure (730 kN over 280 mm) lets a NU1056 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NU1056; an oversized radius locks the ring on its face and tilts the 65 mm-wide seat.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 30400 g NU1056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1056 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1056 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The 70.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NU1056 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 730/1050 kN ratings, 88 kN Pu and 30400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1056?",
        "a": "NU1056 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 65 mm width (11.024 × 16.535 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 730 kN, C0 1050 kN, Pu 88 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 30400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1056 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1056 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1056?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 316 mm, Ew 384 mm. The nominal bore/OD remain 280/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1056-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×420×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1056",
      "NU1056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1056",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1056",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 730,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 88,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 30400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1056 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 280×420×65 mm ISO 15 envelope. Numbering ties NUP1056 to its envelope: type code NUP, series NUP1000, 280 mm bore; the 420×65 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP1056 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,800 r/min for continuously high-duty 280 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 280 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 30400 g NUP1056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1056 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 730/1050 kN pair here belongs to NUP1056 as printed, not to the bare size.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "Do not replace NUP1056 with a deep-groove ball bearing on rating alone: line contact gives 730 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 730/1050 kN ratings, 88 kN Pu and 30400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1056?",
        "a": "NUP1056 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 65 mm width (11.024 × 16.535 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 730 kN, C0 1050 kN, Pu 88 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 30400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1056 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1056 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1056?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 316 mm, Ew 384 mm. The nominal bore/OD remain 280/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1056",
      "NUP1056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2256",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2256",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2050,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2256 appears as a 280 mm bore single-row cylindrical roller bearing (2050 kN C / 3100 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 500 mm OD and 130 mm width from the ISO 15 general plan. With C 2050 kN and C0 3100 kN (C0/C ≈ 1.51) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Equivalent-load planning treats N2256 as a pure radial bearing: keep P below 2050 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2256 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 107000 g N2256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 130 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "If the shaft must be located both ways, do not use N2256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 130 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2256 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "The 2050/3100 kN ratings, 252 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2256?",
        "a": "N2256 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2050 kN, C0 3100 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 107000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2256 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2256 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2256",
      "N2256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N256",
    "brand": "NTN",
    "manufacturer_designation": "NTN N256",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N256 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 280×500×80 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 280 mm (00–03 use the 10/12/15/17 exception table). The 80 mm width and 110.0 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 1,200 r/min is .86 of the 1,400 r/min oil value for N256; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N256 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g N256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open N256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N256 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The N rib arrangement is not interchangeable with another prefix on the same 280 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 500×80 mm envelope matches.",
      "Open N256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N256?",
        "a": "N256 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N256 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N256 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n256",
      "N256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF256",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF256 is the standard section of the NTN NF200 dimension series for a 280 mm shaft — 1320 kN of basic dynamic capacity in a 69400 g, open bearing. Numbering ties NF256 to its envelope: type code NF, series NF200, 280 mm bore; the 500×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,200 r/min grease and 1,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 280 mm bore. The 280 mm (11.024 in) bore and 500 mm (19.685 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF256.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g NF256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "Do not replace NF256 with a deep-groove ball bearing on rating alone: line contact gives 1320 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1320/1760 kN pair here belongs to NF256 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NF256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF256?",
        "a": "NF256 is an NTN NF single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF256 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF256 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf256",
      "NF256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2256",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2050,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2256 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 2050 kN dynamic rating in the 280 mm bore. Numbering ties NJ2256 to its envelope: type code NJ, series NJ2200, 280 mm bore; the 500×130 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 130 mm width and 110.0 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 107000 g for the 280×500×130 mm NJ2256 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 107000 g NJ2256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2256 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "The 110.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 130 mm-wide cavity.",
      "Open NJ2256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "The 2050/3100 kN ratings, 252 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2256?",
        "a": "NJ2256 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2050 kN, C0 3100 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 107000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2256 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2256 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2256",
      "NJ2256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ256",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ256 on the 280×500 mm envelope, 80 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,200 r/min. Numbering ties NJ256 to its envelope: type code NJ, series NJ200, 280 mm bore; the 500×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 80 mm width and 110.0 mm section put the NJ200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 1,200 r/min is .86 of the 1,400 r/min oil value for NJ256; grease-churn heating closes that gap as fill quantity rises. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g NJ256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "Open NJ256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Open NJ256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ256?",
        "a": "NJ256 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ256 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ256 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ256-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×500×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj256",
      "NJ256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2256",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2050,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU2256 on the 280×500 mm envelope, 130 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2256 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. At 1,300 r/min with oil versus 1,100 r/min with grease (a 200 r/min band), lubrication choice for NU2256 is a thermal decision, not just a sealing one. Selection arithmetic: Pu 252 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.51 (3100/2050 kN) shows the high-static-capacity proportioning of this 280 mm bore. Heat the inner ring to max 120 °C for the 280 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 107000 g NU2256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2050/3100 kN pair here belongs to NU2256 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NU2256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 280 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 500×130 mm envelope matches.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NU2256: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 2050/3100 kN ratings, 252 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2256?",
        "a": "NU2256 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2050 kN, C0 3100 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 107000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2256 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2256 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2256-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×500×130 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2256",
      "NU2256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU256",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU256 appears as a 280 mm bore single-row cylindrical roller bearing (1320 kN C / 1760 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NU256 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g NU256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 280 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 500×80 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1320/1760 kN pair here belongs to NU256 as printed, not to the bare size.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU256?",
        "a": "NU256 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU256 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU256 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU256-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×500×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu256",
      "NU256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2256",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2050,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NUP2256: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,100 r/min on grease and 1,300 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2256 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2256 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 280 mm (11.024 in) bore and 500 mm (19.685 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 130 mm-wide ring. Heat the inner ring to max 120 °C for the 280 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 107000 g NUP2256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2050/3100 kN pair here belongs to NUP2256 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NUP2256 with a deep-groove ball bearing on rating alone: line contact gives 2050 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2050/3100 kN ratings, 252 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2256?",
        "a": "NUP2256 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2050 kN, C0 3100 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 107000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2256 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2256 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2256",
      "NUP2256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP256",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP256 denotes a 280×500×80 mm (11.024 × 19.685 × 3.15 in) cylindrical roller bearing in the NUP200 family, a pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 500 mm OD and 80 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP256 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 280 mm (11.024 in) bore and 500 mm (19.685 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NUP256; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g NUP256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NUP256: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP256 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP256?",
        "a": "NUP256 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP256 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP256 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup256",
      "NUP256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2356",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2356",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3000,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1100,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2356 is the extra-wide (23) section of the NTN N2300 dimension series for a 280 mm shaft — 3000 kN of basic dynamic capacity in a 218000 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N2356 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2356 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 3000 kN C assumes clean oil and adequate film; the 335 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2356 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 218000 g N2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 280 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 580×175 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 3000/4250 kN pair here belongs to N2356 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2356?",
        "a": "N2356 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3000 kN, C0 4250 kN, Pu 335 kN, grease limiting speed 920 r/min, oil 1,100 r/min, mass about 218000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2356 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2356 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 920 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2356",
      "N2356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N356",
    "brand": "NTN",
    "manufacturer_designation": "NTN N356",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N356 on the 280×580 mm envelope, 108 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. Digit by digit, N356 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,100 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 280 mm bore. Equivalent-load planning treats N356 as a pure radial bearing: keep P below 2010 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g N356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N356 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace N356 with a deep-groove ball bearing on rating alone: line contact gives 2010 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2010/2540 kN pair here belongs to N356 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use N356 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N356?",
        "a": "N356 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N356 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N356 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n356",
      "N356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF356",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NF356 denotes a 280×580×108 mm (11.024 × 22.835 × 4.252 in) cylindrical roller bearing in the NF300 family, a pressed sheet-steel cage. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 580 mm OD and 108 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF356. Rating life at 2010 kN C assumes clean oil and adequate film; the 200 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 280 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g NF356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NF356 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Grease limiting speed 1,100 r/min and oil 1,200 r/min are different limits for NF356: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NF356 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF356?",
        "a": "NF356 is an NTN NF single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF356 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF356 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf356",
      "NF356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2356",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3000,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1100,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2356 appears as a 280 mm bore single-row cylindrical roller bearing (3000 kN C / 4250 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 580 mm OD and 175 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 920 r/min grease and 1,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 280 mm bore. The 10.7 kN-per-mm-bore figure (3000 kN over 280 mm) lets a NJ2356 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NJ2356; an oversized radius locks the ring on its face and tilts the 175 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 218000 g NJ2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 3000/4250 kN pair here belongs to NJ2356 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NJ2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NJ2356 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2356?",
        "a": "NJ2356 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3000 kN, C0 4250 kN, Pu 335 kN, grease limiting speed 920 r/min, oil 1,100 r/min, mass about 218000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2356 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2356 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 920 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2356",
      "NJ2356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ356",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NJ356: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,100 r/min on grease and 1,200 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ356 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ356. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,200 r/min for continuously high-duty 280 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g NJ356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ356 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "The 150.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.",
      "Grease limiting speed 1,100 r/min and oil 1,200 r/min are different limits for NJ356: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ356?",
        "a": "NJ356 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ356 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ356 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj356",
      "NJ356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2356",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3000,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1100,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NU2356: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 920 r/min on grease and 1,100 r/min on oil. Digit by digit, NU2356 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 175 mm width and 150.0 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 920 r/min is .84 of the 1,100 r/min oil value for NU2356; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 280 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 218000 g NU2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 3000/4250 kN pair here belongs to NU2356 as printed, not to the bare size.",
      "Do not replace NU2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU2356 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2356?",
        "a": "NU2356 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3000 kN, C0 4250 kN, Pu 335 kN, grease limiting speed 920 r/min, oil 1,100 r/min, mass about 218000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2356 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2356 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 920 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2356-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×580×175 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2356",
      "NU2356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU356",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU356 is the standard section of the NTN NU300 dimension series for a 280 mm shaft — 2010 kN of basic dynamic capacity in a 139000 g, open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 580 mm OD and 108 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU356 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 2010 kN C assumes clean oil and adequate film; the 200 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g NU356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU356 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "The 150.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.",
      "Do not replace NU356 with a deep-groove ball bearing on rating alone: line contact gives 2010 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NU356 with a deep-groove ball bearing on rating alone: line contact gives 2010 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU356?",
        "a": "NU356 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU356 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU356 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu356",
      "NU356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2356",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3000,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1100,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2356 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 3000 kN dynamic rating in the 280 mm bore. Digit by digit, NUP2356 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2356 designation when purchasing. Selection arithmetic: Pu 335 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.42 (4250/3000 kN) shows the high-static-capacity proportioning of this 280 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2356.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 218000 g NUP2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 280 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 580×175 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP2356 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 175 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2356?",
        "a": "NUP2356 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3000 kN, C0 4250 kN, Pu 335 kN, grease limiting speed 920 r/min, oil 1,100 r/min, mass about 218000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2356 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2356 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 920 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2356",
      "NUP2356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP356",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP356 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 280×580×108 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 280 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP356 designation when purchasing. Mass 139000 g for the 280×580×108 mm NUP356 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP356; an oversized radius locks the ring on its face and tilts the 108 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g NUP356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP356 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Do not replace NUP356 with a deep-groove ball bearing on rating alone: line contact gives 2010 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP356?",
        "a": "NUP356 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP356 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP356 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup356",
      "NUP356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4960",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4960",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1330,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 231,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 46400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN4960 appears as a 300 mm bore single-row cylindrical roller bearing (1330 kN C / 2800 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4960 floats or locates; the numeric remainder is the ISO 15 series and 300 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Thermal planning around the 1,300 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,500 r/min for continuously high-duty 300 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 300 mm shaft.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 46400 g NN4960 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4960 does not substitute a precision-class execution.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4960 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 1330/2800 kN ratings, 231 kN Pu and 46400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4960 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4960?",
        "a": "NN4960 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 118 mm width (11.811 × 16.535 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 2800 kN, Pu 231 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 46400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4960 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4960 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4960?",
        "a": "NN4960 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4960?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 339 mm. The nominal bore/OD remain 300/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4960",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4960",
      "NN4960"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4960K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4960K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1330,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 231,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 44200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN4960K on the 300×420 mm envelope, 118 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,300 r/min. Numbering ties NN4960K to its envelope: type code NN, series NN4900, 300 mm bore; the 420×118 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 118 mm width and 60.0 mm section put the NN4900 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN4960K.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 44200 g NN4960K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1330/2800 kN pair here belongs to NN4960K as printed, not to the bare size.",
      "The 60.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 118 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 300 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NN4960K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The 1330/2800 kN ratings, 231 kN Pu and 44200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4960K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4960K?",
        "a": "NN4960K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 118 mm width (11.811 × 16.535 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 2800 kN, Pu 231 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 44200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4960K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4960K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4960K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4960K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4960 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4960K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 339 mm. The nominal bore/OD remain 300/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4960K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4960k",
      "NN4960K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4960K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4960K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1330,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 231,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 46400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NNU4960K denotes a 300×420×118 mm (11.811 × 16.535 × 4.646 in) cylindrical roller bearing in the NNU4900 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NNU states which ring carries the ribs, which determines whether NNU4960K floats or locates; the numeric remainder is the ISO 15 series and 300 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NNU4960K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,300 r/min is .87 of the 1,500 r/min oil value for NNU4960K; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NNU4960K; an oversized radius locks the ring on its face and tilts the 118 mm-wide seat.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 46400 g NNU4960K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NNU4960K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4960K skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for NNU4960K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NNU4960K with a deep-groove ball bearing on rating alone: line contact gives 1330 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1330/2800 kN ratings, 231 kN Pu and 46400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4960K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4960K?",
        "a": "NNU4960K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 118 mm width (11.811 × 16.535 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 2800 kN, Pu 231 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 46400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4960K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4960K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4960K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4960K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4960 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4960K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 339 mm. The nominal bore/OD remain 300/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4960K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4960k",
      "NNU4960K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1060",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1060",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 42900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1060 is the extra-light (10/49) section of the NTN N1000 dimension series for a 300 mm shaft — 950 kN of basic dynamic capacity in a 42900 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 300 mm, with 460 mm OD and 74 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1060 designation when purchasing. Selection arithmetic: Pu 109 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.41 (1340/950 kN) shows the high-static-capacity proportioning of this 300 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N1060.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 42900 g N1060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The N rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×74 mm envelope matches.",
      "If the shaft must be located both ways, do not use N1060 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 950/1340 kN ratings, 109 kN Pu and 42900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1060?",
        "a": "N1060 is an NTN N single-row cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 74 mm width (11.811 × 18.11 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1340 kN, Pu 109 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 42900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1060 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1060 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1060?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 420 mm. The nominal bore/OD remain 300/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1060",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1060",
      "N1060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1060",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1060",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 42900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ1060 appears as a 300 mm bore single-row cylindrical roller bearing (950 kN C / 1340 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NJ1060 to its envelope: type code NJ, series NJ1000, 300 mm bore; the 460×74 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 950 kN and C0 1340 kN (C0/C ≈ 1.41) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Speed ratio check: limiting 1,400 r/min is .88 of the 1,600 r/min oil value for NJ1060; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ1060 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 42900 g NJ1060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NJ1060: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NJ1060: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1060 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 950/1340 kN ratings, 109 kN Pu and 42900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1060?",
        "a": "NJ1060 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 74 mm width (11.811 × 18.11 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1340 kN, Pu 109 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 42900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1060 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1060 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1060?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 420 mm. The nominal bore/OD remain 300/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1060-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 300×460×74 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1060",
      "NJ1060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3060",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3060",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1470,
    "static_load_kN": 2560,
    "fatigue_load_limit_kN": 209,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 70800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 300 mm shaft NTN supplies NN3060: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,200 r/min on grease and 1,500 r/min on oil. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Rating life at 1470 kN C assumes clean oil and adequate film; the 209 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NN3060; an oversized radius locks the ring on its face and tilts the 118 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 70800 g NN3060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 118 mm-wide cavity.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3060 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 1470/2560 kN ratings, 209 kN Pu and 70800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3060?",
        "a": "NN3060 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 118 mm width (11.811 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1470 kN, C0 2560 kN, Pu 209 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 70800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3060 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3060?",
        "a": "NN3060 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3060?",
        "a": "NTN rates NN3060 at 1,200 r/min with grease and 1,500 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3060",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3060",
      "NN3060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3060K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3060K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1470,
    "static_load_kN": 2560,
    "fatigue_load_limit_kN": 209,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 68600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3060K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 300×460×118 mm ISO 15 envelope. Digit by digit, NN3060K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 300 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3060K. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Housing and shaft fillets must clear the ring chamfers of NN3060K; an oversized radius locks the ring on its face and tilts the 118 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 68600 g NN3060K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN3060K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3060K skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The K tapered bore of NN3060K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 1470/2560 kN ratings, 209 kN Pu and 68600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3060K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3060K?",
        "a": "NN3060K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 118 mm width (11.811 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1470 kN, C0 2560 kN, Pu 209 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 68600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3060K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3060K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3060K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3060K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3060 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3060K?",
        "a": "NTN rates NN3060K at 1,200 r/min with grease and 1,500 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3060K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3060k",
      "NN3060K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1060",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1060",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 42900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 300 mm shaft NTN supplies NU1060: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,400 r/min on grease and 1,600 r/min on oil. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1060. The 300 mm (11.811 in) bore and 460 mm (18.11 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 74 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NU1060; an oversized radius locks the ring on its face and tilts the 74 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 42900 g NU1060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU1060 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 300 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×74 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 950/1340 kN ratings, 109 kN Pu and 42900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1060?",
        "a": "NU1060 is an NTN NU single-row cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 74 mm width (11.811 × 18.11 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1340 kN, Pu 109 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 42900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1060 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1060 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1060?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 420 mm. The nominal bore/OD remain 300/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1060-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 300×460×74 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1060",
      "NU1060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1060",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1060",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 42900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 300 mm shaft NTN supplies NUP1060: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,400 r/min on grease and 1,600 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1060 designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 300 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 42900 g NUP1060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP1060 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NUP1060: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 80.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 74 mm-wide cavity.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 950/1340 kN ratings, 109 kN Pu and 42900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1060?",
        "a": "NUP1060 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 74 mm width (11.811 × 18.11 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1340 kN, Pu 109 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 42900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1060 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1060 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1060?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 420 mm. The nominal bore/OD remain 300/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1060",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1060",
      "NUP1060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2260",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2260",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2420,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 290,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N2260 denotes a 300×540×140 mm (11.811 × 21.26 × 5.512 in) cylindrical roller bearing in the N2200 family, a pressed sheet-steel cage. Digit by digit, N2260 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 300 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 290 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.51 (3650/2420 kN) shows the high-static-capacity proportioning of this 300 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2260 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 135000 g N2260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2420/3650 kN pair here belongs to N2260 as printed, not to the bare size.",
      "Do not replace N2260 with a deep-groove ball bearing on rating alone: line contact gives 2420 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 120.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 140 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2420/3650 kN pair here belongs to N2260 as printed, not to the bare size.",
      "The 2420/3650 kN ratings, 290 kN Pu and 135000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2260?",
        "a": "N2260 is an NTN N single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 3650 kN, Pu 290 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 135000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2260 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2260 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2260",
      "N2260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N260",
    "brand": "NTN",
    "manufacturer_designation": "NTN N260",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 300 mm shaft NTN supplies N260: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,100 r/min on grease and 1,300 r/min on oil. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 300 mm, with 540 mm OD and 85 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,100 r/min grease and 1,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 300 mm bore. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,300 r/min for continuously high-duty 300 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N260 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g N260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×85 mm envelope matches.",
      "The N rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×85 mm envelope matches.",
      "Open N260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "If the shaft must be located both ways, do not use N260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N260?",
        "a": "N260 is an NTN N single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N260 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N260 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n260",
      "N260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF260",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF260 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 300×540×85 mm ISO 15 envelope. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF260. Mass 86400 g for the 300×540×85 mm NF260 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF260.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g NF260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 85 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Open NF260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The 85 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF260?",
        "a": "NF260 is an NTN NF single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF260 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF260 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf260",
      "NF260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2260",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2420,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 290,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2260 is the wide (22) section of the NTN NJ2200 dimension series for a 300 mm shaft — 2420 kN of basic dynamic capacity in a 135000 g, open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,000 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 300 mm bore. Equivalent-load planning treats NJ2260 as a pure radial bearing: keep P below 2420 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 135000 g NJ2260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The 140 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ2260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 2420/3650 kN ratings, 290 kN Pu and 135000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2260?",
        "a": "NJ2260 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 3650 kN, Pu 290 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 135000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2260 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2260 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2260",
      "NJ2260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ260",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ260 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1560 kN dynamic rating in the 300 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,100 r/min grease and 1,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 300 mm bore. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,300 r/min for continuously high-duty 300 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g NJ260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NJ260: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NJ260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ260 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NJ260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ260?",
        "a": "NJ260 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ260 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ260 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj260",
      "NJ260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2260",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2420,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 290,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2260 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 2420 kN dynamic rating in the 300 mm bore. Numbering ties NU2260 to its envelope: type code NU, series NU2200, 300 mm bore; the 540×140 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 120.0 mm radial section ((540−300)/2) frames the roller complement; capacity per millimetre of bore is about 8.1 kN/mm before application factors. Speed ratio check: limiting 1,000 r/min is .83 of the 1,200 r/min oil value for NU2260; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 300 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 135000 g NU2260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU2260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NU2260 with a deep-groove ball bearing on rating alone: line contact gives 2420 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU2260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The 120.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 140 mm-wide cavity.",
      "The 2420/3650 kN ratings, 290 kN Pu and 135000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2260?",
        "a": "NU2260 is an NTN NU single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 3650 kN, Pu 290 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 135000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2260 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2260 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2260-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 300×540×140 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2260",
      "NU2260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU260",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU260 denotes a 300×540×85 mm (11.811 × 21.26 × 3.346 in) cylindrical roller bearing in the NU200 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU260 floats or locates; the numeric remainder is the ISO 15 series and 300 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU260 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 1560 kN C assumes clean oil and adequate film; the 164 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g NU260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NU260: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NU260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NU260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "Wide (22/23) and light (10/49) executions at 300 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU260?",
        "a": "NU260 is an NTN NU single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU260 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU260 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU260-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu260",
      "NU260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2260",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2420,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 290,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2260 appears as a 300 mm bore single-row cylindrical roller bearing (2420 kN C / 3650 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP2260 to its envelope: type code NUP, series NUP2200, 300 mm bore; the 540×140 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2260 designation when purchasing. Mass 135000 g for the 300×540×140 mm NUP2260 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 300 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 135000 g NUP2260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP2260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 120.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 140 mm-wide cavity.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×140 mm envelope matches.",
      "The 140 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 2420/3650 kN ratings, 290 kN Pu and 135000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2260?",
        "a": "NUP2260 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 3650 kN, Pu 290 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 135000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2260 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2260 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2260",
      "NUP2260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP260",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP260 on the 300×540 mm envelope, 85 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. Digit by digit, NUP260 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 300 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP260 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 86400 g for the 300×540×85 mm NUP260 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP260; an oversized radius locks the ring on its face and tilts the 85 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g NUP260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP260 with a deep-groove ball bearing on rating alone: line contact gives 1560 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×85 mm envelope matches.",
      "The 120.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 85 mm-wide cavity.",
      "Do not replace NUP260 with a deep-groove ball bearing on rating alone: line contact gives 1560 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP260?",
        "a": "NUP260 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP260 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP260 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup260",
      "NUP260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4964",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4964",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 2970,
    "fatigue_load_limit_kN": 242,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 49000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN4964 denotes a 320×440×118 mm (12.598 × 17.323 × 4.646 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN4964 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 320 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NN4964 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 242 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 2.17 (2970/1370 kN) shows the high-static-capacity proportioning of this 320 mm bore. Heat the inner ring to max 120 °C for the 320 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 49000 g NN4964 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 320 mm inner ring.",
      "The 60.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 118 mm-wide cavity.",
      "Do not replace NN4964 with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NN4964 with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1370/2970 kN ratings, 242 kN Pu and 49000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4964 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4964?",
        "a": "NN4964 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 118 mm width (12.598 × 17.323 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1370 kN, C0 2970 kN, Pu 242 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 49000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4964 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4964 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4964?",
        "a": "NN4964 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4964?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 359 mm. The nominal bore/OD remain 320/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4964",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4964",
      "NN4964"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4964K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4964K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 2970,
    "fatigue_load_limit_kN": 242,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 46700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4964K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 320×440×118 mm ISO 15 envelope. Digit by digit, NN4964K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 320 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 1,400 r/min with oil versus 1,200 r/min with grease (a 200 r/min band), lubrication choice for NN4964K is a thermal decision, not just a sealing one. Rating life at 1370 kN C assumes clean oil and adequate film; the 242 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 320 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 46700 g NN4964K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN4964K with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1370/2970 kN pair here belongs to NN4964K as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NN4964K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1370/2970 kN ratings, 242 kN Pu and 46700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4964K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4964K?",
        "a": "NN4964K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 118 mm width (12.598 × 17.323 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1370 kN, C0 2970 kN, Pu 242 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 46700 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4964K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4964K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4964K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4964K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4964 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4964K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 359 mm. The nominal bore/OD remain 320/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4964K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4964k",
      "NN4964K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4964K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4964K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 2970,
    "fatigue_load_limit_kN": 242,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 49100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4964K is the extra-light (10/49) section of the NTN NNU4900 dimension series for a 320 mm shaft — 1370 kN of basic dynamic capacity in a 49100 g, open bearing. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 320 mm, with 440 mm OD and 118 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 1,200 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,400 r/min for continuously high-duty 320 mm positions. On NNU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 49100 g NNU4964K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 320 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 440×118 mm envelope matches.",
      "Do not replace NNU4964K with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1370/2970 kN pair here belongs to NNU4964K as printed, not to the bare size.",
      "The 1370/2970 kN ratings, 242 kN Pu and 49100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4964K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4964K?",
        "a": "NNU4964K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 118 mm width (12.598 × 17.323 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1370 kN, C0 2970 kN, Pu 242 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 49100 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4964K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4964K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4964K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4964K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4964 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4964K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 359 mm. The nominal bore/OD remain 320/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4964K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4964k",
      "NNU4964K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1064",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1064",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 970,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 45300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1064 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 320×480×74 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 320 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1064 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 45300 g for the 320×480×74 mm N1064 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 320 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 45300 g N1064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 320 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 480×74 mm envelope matches.",
      "Open N1064 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 970/1410 kN pair here belongs to N1064 as printed, not to the bare size.",
      "Do not replace N1064 with a deep-groove ball bearing on rating alone: line contact gives 970 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 970/1410 kN ratings, 113 kN Pu and 45300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1064?",
        "a": "N1064 is an NTN N single-row cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 74 mm width (12.598 × 18.898 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 970 kN, C0 1410 kN, Pu 113 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 45300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1064 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1064 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1064?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 360 mm, Ew 440 mm. The nominal bore/OD remain 320/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1064",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1064",
      "N1064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1064",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1064",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 970,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 45300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ1064 denotes a 320×480×74 mm (12.598 × 18.898 × 2.913 in) cylindrical roller bearing in the NJ1000 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1064 floats or locates; the numeric remainder is the ISO 15 series and 320 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1064. Equivalent-load planning treats NJ1064 as a pure radial bearing: keep P below 970 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 45300 g NJ1064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 970/1410 kN pair here belongs to NJ1064 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NJ1064 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "The 970/1410 kN ratings, 113 kN Pu and 45300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1064?",
        "a": "NJ1064 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 74 mm width (12.598 × 18.898 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 970 kN, C0 1410 kN, Pu 113 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 45300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1064 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1064 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1064?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 360 mm, Ew 440 mm. The nominal bore/OD remain 320/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1064-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×480×74 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1064",
      "NJ1064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3064",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3064",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2670,
    "fatigue_load_limit_kN": 214,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 76200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3064 appears as a 320 mm bore single-row cylindrical roller bearing (1500 kN C / 2670 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NN3064 to its envelope: type code NN, series NN3000, 320 mm bore; the 480×121 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3064 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,300 r/min for continuously high-duty 320 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 320 mm shaft.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 76200 g NN3064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 80.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 121 mm-wide cavity.",
      "Do not replace NN3064 with a deep-groove ball bearing on rating alone: line contact gives 1500 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NN3064 with a deep-groove ball bearing on rating alone: line contact gives 1500 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1500/2670 kN ratings, 214 kN Pu and 76200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3064?",
        "a": "NN3064 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 121 mm width (12.598 × 18.898 × 4.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2670 kN, Pu 214 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 76200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3064 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3064?",
        "a": "NN3064 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3064?",
        "a": "NTN rates NN3064 at 1,100 r/min with grease and 1,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3064",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3064",
      "NN3064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3064K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3064K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2670,
    "fatigue_load_limit_kN": 214,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 73500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3064K denotes a 320×480×121 mm (12.598 × 18.898 × 4.764 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 320 mm (00–03 use the 10/12/15/17 exception table). The 121 mm width and 80.0 mm section put the NN3000 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 1500 kN C assumes clean oil and adequate film; the 214 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 73500 g NN3064K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 320 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 480×121 mm envelope matches.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NN3064K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NN3064K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The 1500/2670 kN ratings, 214 kN Pu and 73500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3064K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3064K?",
        "a": "NN3064K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 121 mm width (12.598 × 18.898 × 4.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2670 kN, Pu 214 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 73500 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3064K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3064K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3064K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3064K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3064 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3064K?",
        "a": "NTN rates NN3064K at 1,100 r/min with grease and 1,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3064K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3064k",
      "NN3064K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1064",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1064",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 970,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 45300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU1064 appears as a 320 mm bore single-row cylindrical roller bearing (970 kN C / 1410 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NU1064 to its envelope: type code NU, series NU1000, 320 mm bore; the 480×74 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,300 r/min grease and 1,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 320 mm bore. Rating life at 970 kN C assumes clean oil and adequate film; the 113 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 320 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 45300 g NU1064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU1064 with a deep-groove ball bearing on rating alone: line contact gives 970 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU1064 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use NU1064 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 970/1410 kN ratings, 113 kN Pu and 45300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1064?",
        "a": "NU1064 is an NTN NU single-row cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 74 mm width (12.598 × 18.898 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 970 kN, C0 1410 kN, Pu 113 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 45300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1064 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1064 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1064?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 360 mm, Ew 440 mm. The nominal bore/OD remain 320/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1064-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×480×74 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1064",
      "NU1064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1064",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1064",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 970,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 45300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP1064 appears as a 320 mm bore single-row cylindrical roller bearing (970 kN C / 1410 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP1064 to its envelope: type code NUP, series NUP1000, 320 mm bore; the 480×74 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP1064 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,300 r/min is .87 of the 1,500 r/min oil value for NUP1064; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP1064 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 45300 g NUP1064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP1064 with a deep-groove ball bearing on rating alone: line contact gives 970 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NUP1064 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "Do not replace NUP1064 with a deep-groove ball bearing on rating alone: line contact gives 970 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 970/1410 kN ratings, 113 kN Pu and 45300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1064?",
        "a": "NUP1064 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 74 mm width (12.598 × 18.898 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 970 kN, C0 1410 kN, Pu 113 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 45300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1064 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1064 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1064?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 360 mm, Ew 440 mm. The nominal bore/OD remain 320/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1064",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1064",
      "NUP1064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2264",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2264",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 4350,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 168000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N2264 on the 320×580 mm envelope, 150 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 950 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 320 mm, with 580 mm OD and 150 mm width from the ISO 15 general plan. With C 2830 kN and C0 4350 kN (C0/C ≈ 1.54) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Mass 168000 g for the 320×580×150 mm N2264 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 168000 g N2264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 130.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 150 mm-wide cavity.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for N2264: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2264 skids at 950 r/min and fails by smearing long before L10 fatigue.",
      "The 2830/4350 kN ratings, 340 kN Pu and 168000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2264?",
        "a": "N2264 is an NTN N single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 4350 kN, Pu 340 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 168000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2264 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2264 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2264",
      "N2264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N264",
    "brand": "NTN",
    "manufacturer_designation": "NTN N264",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N264 appears as a 320 mm bore single-row cylindrical roller bearing (1780 kN C / 2390 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 320 mm (00–03 use the 10/12/15/17 exception table). The 92 mm width and 130.0 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 186 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.34 (2390/1780 kN) shows the high-static-capacity proportioning of this 320 mm bore. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g N264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N264 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "Open N264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N264 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "Open N264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N264?",
        "a": "N264 is an NTN N single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N264 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N264 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n264",
      "N264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF264",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 320 mm shaft NTN supplies NF264: one integral rib on each ring; the open execution is rated 1,000 r/min on grease and 1,200 r/min on oil. Numbering ties NF264 to its envelope: type code NF, series NF200, 320 mm bore; the 580×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,000 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 320 mm bore. The 5.6 kN-per-mm-bore figure (1780 kN over 320 mm) lets a NF264 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 320 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g NF264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF264 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "The 130.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NF264 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF264?",
        "a": "NF264 is an NTN NF single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF264 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF264 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf264",
      "NF264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2264",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 4350,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 168000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2264 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 320×580×150 mm ISO 15 envelope. Numbering ties NJ2264 to its envelope: type code NJ, series NJ2200, 320 mm bore; the 580×150 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 150 mm width and 130.0 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 320 mm (12.598 in) bore and 580 mm (22.835 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 150 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NJ2264; an oversized radius locks the ring on its face and tilts the 150 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 168000 g NJ2264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ2264 with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 130.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 150 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NJ2264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The 2830/4350 kN ratings, 340 kN Pu and 168000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2264?",
        "a": "NJ2264 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 4350 kN, Pu 340 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 168000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2264 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2264 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2264",
      "NJ2264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ264",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ264 is the standard section of the NTN NJ200 dimension series for a 320 mm shaft — 1780 kN of basic dynamic capacity in a 109000 g, open bearing. Numbering ties NJ264 to its envelope: type code NJ, series NJ200, 320 mm bore; the 580×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 92 mm width and 130.0 mm section put the NJ200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 186 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.34 (2390/1780 kN) shows the high-static-capacity proportioning of this 320 mm bore. Housing and shaft fillets must clear the ring chamfers of NJ264; an oversized radius locks the ring on its face and tilts the 92 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g NJ264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NJ264 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NJ264 as printed, not to the bare size.",
      "Do not replace NJ264 with a deep-groove ball bearing on rating alone: line contact gives 1780 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NJ264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ264?",
        "a": "NJ264 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ264 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ264 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj264",
      "NJ264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2264",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 4350,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 168000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2264 is the wide (22) section of the NTN NU2200 dimension series for a 320 mm shaft — 2830 kN of basic dynamic capacity in a 168000 g, open bearing. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2264 floats or locates; the numeric remainder is the ISO 15 series and 320 mm bore reference, not a fit or clearance instruction. At 1,100 r/min with oil versus 950 r/min with grease (a 150 r/min band), lubrication choice for NU2264 is a thermal decision, not just a sealing one. Equivalent-load planning treats NU2264 as a pure radial bearing: keep P below 2830 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2264.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 168000 g NU2264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 150 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 320 mm inner ring.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NU2264: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2264 skids at 950 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NU2264: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 2830/4350 kN ratings, 340 kN Pu and 168000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2264?",
        "a": "NU2264 is an NTN NU single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 4350 kN, Pu 340 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 168000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2264 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2264 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2264-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×580×150 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2264",
      "NU2264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU264",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU264 on the 320×580 mm envelope, 92 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,000 r/min. Digit by digit, NU264 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 320 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Thermal planning around the 1,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,200 r/min for continuously high-duty 320 mm positions. Housing and shaft fillets must clear the ring chamfers of NU264; an oversized radius locks the ring on its face and tilts the 92 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g NU264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NU264 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NU264 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU264 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NU264 as printed, not to the bare size.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU264?",
        "a": "NU264 is an NTN NU single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU264 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU264 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU264-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×580×92 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu264",
      "NU264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2264",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 4350,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 168000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2264 denotes a 320×580×150 mm (12.598 × 22.835 × 5.906 in) cylindrical roller bearing in the NUP2200 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2264 floats or locates; the numeric remainder is the ISO 15 series and 320 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2264 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 8.8 kN-per-mm-bore figure (2830 kN over 320 mm) lets a NUP2264 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2264.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 168000 g NUP2264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 150 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 320 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "Open NUP2264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "Do not replace NUP2264 with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2830/4350 kN ratings, 340 kN Pu and 168000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2264?",
        "a": "NUP2264 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 4350 kN, Pu 340 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 168000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2264 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2264 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2264",
      "NUP2264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP264",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP264 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1780 kN dynamic rating in the 320 mm bore. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 320 mm, with 580 mm OD and 92 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP264 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 5.6 kN-per-mm-bore figure (1780 kN over 320 mm) lets a NUP264 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 320 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g NUP264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP264 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NUP264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP264?",
        "a": "NUP264 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP264 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP264 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup264",
      "NUP264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4968K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4968K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1410,
    "static_load_kN": 3150,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 51700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NNU4968K appears as a 340 mm bore single-row cylindrical roller bearing (1410 kN C / 3150 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NNU4968K to its envelope: type code NNU, series NNU4900, 340 mm bore; the 460×118 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NNU4968K. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NNU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NNU4968K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 51700 g NNU4968K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1410/3150 kN pair here belongs to NNU4968K as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4968K skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 1410/3150 kN ratings, 252 kN Pu and 51700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4968K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4968K?",
        "a": "NNU4968K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 340 mm bore, 460 mm OD and 118 mm width (13.386 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1410 kN, C0 3150 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 51700 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4968K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4968K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4968K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4968K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4968 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4968K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 379 mm. The nominal bore/OD remain 340/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4968K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4968k",
      "NNU4968K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1068",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1068",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1160,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 60800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 340 mm shaft NTN supplies N1068: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,200 r/min on grease and 1,400 r/min on oil. Numbering ties N1068 to its envelope: type code N, series N1000, 340 mm bore; the 520×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N1068 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 3.4 kN-per-mm-bore figure (1160 kN over 340 mm) lets a N1068 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N1068 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 60800 g N1068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1068 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1068 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 82 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 340 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 340 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1160/1670 kN ratings, 132 kN Pu and 60800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1068?",
        "a": "N1068 is an NTN N single-row cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 82 mm width (13.386 × 20.472 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1160 kN, C0 1670 kN, Pu 132 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 60800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1068 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1068 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1068?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 385 mm, Ew 475 mm. The nominal bore/OD remain 340/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1068",
      "N1068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1068",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1068",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1160,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 60800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ1068 on the 340×520 mm envelope, 82 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,200 r/min. Digit by digit, NJ1068 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 340 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,200 r/min grease and 1,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 340 mm bore. The 340 mm (13.386 in) bore and 520 mm (20.472 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 82 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NJ1068; an oversized radius locks the ring on its face and tilts the 82 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 60800 g NJ1068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90.0 mm section at 340 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1160/1670 kN pair here belongs to NJ1068 as printed, not to the bare size.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 340 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 520×82 mm envelope matches.",
      "If the shaft must be located both ways, do not use NJ1068 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1160/1670 kN ratings, 132 kN Pu and 60800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1068?",
        "a": "NJ1068 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 82 mm width (13.386 × 20.472 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1160 kN, C0 1670 kN, Pu 132 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 60800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1068 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1068 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1068?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 385 mm, Ew 475 mm. The nominal bore/OD remain 340/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1068",
      "NJ1068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3068",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3068",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1800,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 251,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3068 denotes a 340×520×133 mm (13.386 × 20.472 × 5.236 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3068 floats or locates; the numeric remainder is the ISO 15 series and 340 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3068 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 251 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.78 (3200/1800 kN) shows the high-static-capacity proportioning of this 340 mm bore. Heat the inner ring to max 120 °C for the 340 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 102000 g NN3068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN3068 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 340 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 520 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NN3068: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Wide (22/23) and light (10/49) executions at 340 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1800/3200 kN ratings, 251 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3068?",
        "a": "NN3068 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 133 mm width (13.386 × 20.472 × 5.236 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1800 kN, C0 3200 kN, Pu 251 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 102000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3068 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3068?",
        "a": "NN3068 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3068?",
        "a": "NTN rates NN3068 at 1,100 r/min with grease and 1,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3068",
      "NN3068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3068K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3068K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1800,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 251,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 98500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3068K is the standard section of the NTN NN3000 dimension series for a 340 mm shaft — 1800 kN of basic dynamic capacity in a 98500 g, open bearing. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3068K floats or locates; the numeric remainder is the ISO 15 series and 340 mm bore reference, not a fit or clearance instruction. At 1,300 r/min with oil versus 1,100 r/min with grease (a 200 r/min band), lubrication choice for NN3068K is a thermal decision, not just a sealing one. The 5.3 kN-per-mm-bore figure (1800 kN over 340 mm) lets a NN3068K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3068K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 98500 g NN3068K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1800/3200 kN pair here belongs to NN3068K as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 520 mm race brinells and releases as vibration within hours.",
      "Do not replace NN3068K with a deep-groove ball bearing on rating alone: line contact gives 1800 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NN3068K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1800/3200 kN ratings, 251 kN Pu and 98500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3068K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3068K?",
        "a": "NN3068K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 133 mm width (13.386 × 20.472 × 5.236 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1800 kN, C0 3200 kN, Pu 251 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 98500 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3068K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3068K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3068K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3068K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3068 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3068K?",
        "a": "NTN rates NN3068K at 1,100 r/min with grease and 1,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3068K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3068k",
      "NN3068K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1068",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1068",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1160,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 60800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU1068 denotes a 340×520×82 mm (13.386 × 20.472 × 3.228 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1068 floats or locates; the numeric remainder is the ISO 15 series and 340 mm bore reference, not a fit or clearance instruction. The 82 mm width and 90.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,400 r/min for continuously high-duty 340 mm positions. Heat the inner ring to max 120 °C for the 340 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 60800 g NU1068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU1068 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1068 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 340 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 520×82 mm envelope matches.",
      "Open NU1068 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 340 mm contact.",
      "The 1160/1670 kN ratings, 132 kN Pu and 60800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1068?",
        "a": "NU1068 is an NTN NU single-row cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 82 mm width (13.386 × 20.472 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1160 kN, C0 1670 kN, Pu 132 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 60800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1068 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1068 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1068?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 385 mm, Ew 475 mm. The nominal bore/OD remain 340/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1068",
      "NU1068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1068",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1068",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1160,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 60800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP1068 denotes a 340×520×82 mm (13.386 × 20.472 × 3.228 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1068 floats or locates; the numeric remainder is the ISO 15 series and 340 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NUP1068 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NUP1068 as a pure radial bearing: keep P below 1160 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 60800 g NUP1068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP1068 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1160/1670 kN pair here belongs to NUP1068 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 340 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 340 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1160/1670 kN ratings, 132 kN Pu and 60800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1068?",
        "a": "NUP1068 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 82 mm width (13.386 × 20.472 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1160 kN, C0 1670 kN, Pu 132 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 60800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1068 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1068 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1068?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 385 mm, Ew 475 mm. The nominal bore/OD remain 340/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1068",
      "NUP1068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4972K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4972K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1430,
    "static_load_kN": 3250,
    "fatigue_load_limit_kN": 255,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 54400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4972K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1430 kN dynamic rating in the 360 mm bore. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 360 mm, with 480 mm OD and 118 mm width from the ISO 15 general plan. Double-row NNU precision cylindrical roller bearing: ribbed outer ring with a separable inner ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Mass 54400 g for the 360×480×118 mm NNU4972K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NNU4972K.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 54400 g NNU4972K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4972K skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4972K skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Open NNU4972K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 360 mm contact.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 360 mm inner ring.",
      "The 1430/3250 kN ratings, 255 kN Pu and 54400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4972K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4972K?",
        "a": "NNU4972K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 360 mm bore, 480 mm OD and 118 mm width (14.173 × 18.898 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1430 kN, C0 3250 kN, Pu 255 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 54400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4972K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4972K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4972K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4972K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4972 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4972K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 398 mm. The nominal bore/OD remain 360/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4972K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4972k",
      "NNU4972K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1072",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1072",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 136,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 63700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N1072 appears as a 360 mm bore single-row cylindrical roller bearing (1190 kN C / 1750 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 360 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1072 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 360 mm (14.173 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 82 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N1072 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 63700 g N1072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open N1072 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 360 mm contact.",
      "The N rib arrangement is not interchangeable with another prefix on the same 360 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×82 mm envelope matches.",
      "The 90.0 mm section at 360 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "Do not replace N1072 with a deep-groove ball bearing on rating alone: line contact gives 1190 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1190/1750 kN ratings, 136 kN Pu and 63700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1072?",
        "a": "N1072 is an NTN N single-row cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 82 mm width (14.173 × 21.26 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1750 kN, Pu 136 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 63700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1072 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1072 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1072?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 405 mm, Ew 495 mm. The nominal bore/OD remain 360/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1072",
      "N1072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1072",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1072",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 136,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 63700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1072 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1190 kN dynamic rating in the 360 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1072 floats or locates; the numeric remainder is the ISO 15 series and 360 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1072. Mass 63700 g for the 360×540×82 mm NJ1072 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NJ1072; an oversized radius locks the ring on its face and tilts the 82 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 63700 g NJ1072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 82 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 360 mm inner ring.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NJ1072: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NJ1072 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 360 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 1190/1750 kN ratings, 136 kN Pu and 63700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1072?",
        "a": "NJ1072 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 82 mm width (14.173 × 21.26 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1750 kN, Pu 136 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 63700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1072 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1072 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1072?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 405 mm, Ew 495 mm. The nominal bore/OD remain 360/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1072",
      "NJ1072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3072",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3072",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1830,
    "static_load_kN": 3300,
    "fatigue_load_limit_kN": 258,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN3072 on the 360×540 mm envelope, 134 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,000 r/min. Numbering ties NN3072 to its envelope: type code NN, series NN3000, 360 mm bore; the 540×134 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3072 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,000 r/min is .83 of the 1,200 r/min oil value for NN3072; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 360 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 107000 g NN3072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 360 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 540×134 mm envelope matches.",
      "The 134 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 360 mm inner ring.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3072 does not substitute a precision-class execution.",
      "Do not replace NN3072 with a deep-groove ball bearing on rating alone: line contact gives 1830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1830/3300 kN ratings, 258 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3072?",
        "a": "NN3072 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 134 mm width (14.173 × 21.26 × 5.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1830 kN, C0 3300 kN, Pu 258 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 107000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3072 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3072?",
        "a": "NN3072 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3072?",
        "a": "NTN rates NN3072 at 1,000 r/min with grease and 1,200 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3072",
      "NN3072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3072K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3072K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1830,
    "static_load_kN": 3300,
    "fatigue_load_limit_kN": 258,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3072K appears as a 360 mm bore single-row cylindrical roller bearing (1830 kN C / 3300 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3072K floats or locates; the numeric remainder is the ISO 15 series and 360 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3072K. The 360 mm (14.173 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 134 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 360 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 103000 g NN3072K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3072K skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "The K tapered bore of NN3072K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 1830/3300 kN ratings, 258 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3072K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3072K?",
        "a": "NN3072K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 134 mm width (14.173 × 21.26 × 5.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1830 kN, C0 3300 kN, Pu 258 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 103000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3072K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3072K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3072K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3072K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3072 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3072K?",
        "a": "NTN rates NN3072K at 1,000 r/min with grease and 1,200 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3072K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3072k",
      "NN3072K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1072",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1072",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 136,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 63700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU1072 on the 360×540 mm envelope, 82 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. Numbering ties NU1072 to its envelope: type code NU, series NU1000, 360 mm bore; the 540×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,100 r/min grease and 1,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 360 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Heat the inner ring to max 120 °C for the 360 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 63700 g NU1072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NU1072: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 360 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×82 mm envelope matches.",
      "Open NU1072 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 360 mm contact.",
      "If the shaft must be located both ways, do not use NU1072 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1190/1750 kN ratings, 136 kN Pu and 63700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1072?",
        "a": "NU1072 is an NTN NU single-row cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 82 mm width (14.173 × 21.26 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1750 kN, Pu 136 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 63700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1072 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1072 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1072?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 405 mm, Ew 495 mm. The nominal bore/OD remain 360/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1072-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1072",
      "NU1072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1072",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1072",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 136,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 63700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP1072 on the 360×540 mm envelope, 82 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. Numbering ties NUP1072 to its envelope: type code NUP, series NUP1000, 360 mm bore; the 540×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP1072 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 136 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.47 (1750/1190 kN) shows the high-static-capacity proportioning of this 360 mm bore. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 63700 g NUP1072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NUP1072: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NUP1072: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 360 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×82 mm envelope matches.",
      "Do not replace NUP1072 with a deep-groove ball bearing on rating alone: line contact gives 1190 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1190/1750 kN ratings, 136 kN Pu and 63700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1072?",
        "a": "NUP1072 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 82 mm width (14.173 × 21.26 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1750 kN, Pu 136 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 63700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1072 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1072 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1072?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 405 mm, Ew 495 mm. The nominal bore/OD remain 360/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1072",
      "NUP1072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4976K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4976K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1810,
    "static_load_kN": 4050,
    "fatigue_load_limit_kN": 315,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 80600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 380 mm shaft NTN supplies NNU4976K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,000 r/min on grease and 1,200 r/min on oil. Numbering ties NNU4976K to its envelope: type code NNU, series NNU4900, 380 mm bore; the 520×140 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NNU4976K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NNU4976K as a pure radial bearing: keep P below 1810 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 380 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 80600 g NNU4976K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 380 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 520×140 mm envelope matches.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 380 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 520×140 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1810/4050 kN ratings, 315 kN Pu and 80600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4976K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4976K?",
        "a": "NNU4976K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 380 mm bore, 520 mm OD and 140 mm width (14.961 × 20.472 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1810 kN, C0 4050 kN, Pu 315 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 80600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4976K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4976K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4976K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4976K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4976 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4976K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm. The nominal bore/OD remain 380/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4976K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4976k",
      "NNU4976K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1076",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1076",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1840,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N1076 denotes a 380×560×82 mm (14.961 × 22.047 × 3.228 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. Numbering ties N1076 to its envelope: type code N, series N1000, 380 mm bore; the 560×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N1076 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 1220 kN C assumes clean oil and adequate film; the 141 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 66500 g N1076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace N1076 with a deep-groove ball bearing on rating alone: line contact gives 1220 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open N1076 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 560 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1220/1840 kN ratings, 141 kN Pu and 66500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1076?",
        "a": "N1076 is an NTN N single-row cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 82 mm width (14.961 × 22.047 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1840 kN, Pu 141 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 66500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1076 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1076 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1076?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm, Ew 515 mm. The nominal bore/OD remain 380/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1076",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1076",
      "N1076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1076",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1076",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1840,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1076 is the extra-light (10/49) section of the NTN NJ1000 dimension series for a 380 mm shaft — 1220 kN of basic dynamic capacity in a 66500 g, open bearing. Digit by digit, NJ1076 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 380 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,100 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 380 mm bore. The 3.2 kN-per-mm-bore figure (1220 kN over 380 mm) lets a NJ1076 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 380 mm shaft.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 66500 g NJ1076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 560 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ1076 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1076 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NJ1076 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1220/1840 kN ratings, 141 kN Pu and 66500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1076?",
        "a": "NJ1076 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 82 mm width (14.961 × 22.047 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1840 kN, Pu 141 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 66500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1076 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1076 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1076?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm, Ew 515 mm. The nominal bore/OD remain 380/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1076-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1076",
      "NJ1076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3076",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3076",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1870,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 265,
    "limiting_speed_rpm": 940,
    "max_rpm": 940,
    "speed_oil_rpm": 1100,
    "weight_g": 113000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3076 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1870 kN dynamic rating in the 380 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3076 floats or locates; the numeric remainder is the ISO 15 series and 380 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3076 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NN3076 as a pure radial bearing: keep P below 1870 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3076.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 113000 g NN3076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3076 skids at 940 r/min and fails by smearing long before L10 fatigue.",
      "The 90.0 mm section at 380 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 135 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1870/3450 kN pair here belongs to NN3076 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1870/3450 kN ratings, 265 kN Pu and 113000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3076?",
        "a": "NN3076 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 135 mm width (14.961 × 22.047 × 5.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1870 kN, C0 3450 kN, Pu 265 kN, grease limiting speed 940 r/min, oil 1,100 r/min, mass about 113000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3076 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3076?",
        "a": "NN3076 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3076?",
        "a": "NTN rates NN3076 at 940 r/min with grease and 1,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3076",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3076",
      "NN3076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3076K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3076K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1870,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 265,
    "limiting_speed_rpm": 940,
    "max_rpm": 940,
    "speed_oil_rpm": 1100,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3076K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1870 kN dynamic rating in the 380 mm bore. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 380 mm, with 560 mm OD and 135 mm width from the ISO 15 general plan. The 135 mm width and 90.0 mm section put the NN3000 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 109000 g for the 380×560×135 mm NN3076K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3076K.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 109000 g NN3076K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1870/3450 kN pair here belongs to NN3076K as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 380 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 560×135 mm envelope matches.",
      "Grease limiting speed 940 r/min and oil 1,100 r/min are different limits for NN3076K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NN3076K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "The 1870/3450 kN ratings, 265 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3076K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3076K?",
        "a": "NN3076K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 135 mm width (14.961 × 22.047 × 5.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1870 kN, C0 3450 kN, Pu 265 kN, grease limiting speed 940 r/min, oil 1,100 r/min, mass about 109000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3076K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3076K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3076K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3076K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3076 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3076K?",
        "a": "NTN rates NN3076K at 940 r/min with grease and 1,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3076K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3076k",
      "NN3076K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1076",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1076",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1840,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1076 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1220 kN dynamic rating in the 380 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1076 floats or locates; the numeric remainder is the ISO 15 series and 380 mm bore reference, not a fit or clearance instruction. The 82 mm width and 90.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 1,100 r/min is .92 of the 1,200 r/min oil value for NU1076; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1076.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 66500 g NU1076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1220/1840 kN pair here belongs to NU1076 as printed, not to the bare size.",
      "Open NU1076 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1076 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Open NU1076 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "The 1220/1840 kN ratings, 141 kN Pu and 66500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1076?",
        "a": "NU1076 is an NTN NU single-row cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 82 mm width (14.961 × 22.047 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1840 kN, Pu 141 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 66500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1076 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1076 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1076?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm, Ew 515 mm. The nominal bore/OD remain 380/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1076-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1076",
      "NU1076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1076",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1076",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1840,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1076 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1220 kN dynamic rating in the 380 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1076 floats or locates; the numeric remainder is the ISO 15 series and 380 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NUP1076 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 66500 g for the 380×560×82 mm NUP1076 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP1076; an oversized radius locks the ring on its face and tilts the 82 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 66500 g NUP1076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1220/1840 kN pair here belongs to NUP1076 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NUP1076 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NUP1076 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1220/1840 kN ratings, 141 kN Pu and 66500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1076?",
        "a": "NUP1076 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 82 mm width (14.961 × 22.047 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1840 kN, Pu 141 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 66500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1076 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1076 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1076?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm, Ew 515 mm. The nominal bore/OD remain 380/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1076",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1076",
      "NUP1076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4980K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4980K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1870,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 940,
    "max_rpm": 940,
    "speed_oil_rpm": 1100,
    "weight_g": 84100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NNU4980K on the 400×540 mm envelope, 140 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 940 r/min. Numbering ties NNU4980K to its envelope: type code NNU, series NNU4900, 400 mm bore; the 540×140 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 1,100 r/min with oil versus 940 r/min with grease (a 160 r/min band), lubrication choice for NNU4980K is a thermal decision, not just a sealing one. Selection arithmetic: Pu 325 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 2.30 (4300/1870 kN) shows the high-static-capacity proportioning of this 400 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 400 mm shaft.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 84100 g NNU4980K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4980K skids at 940 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 940 r/min and oil 1,100 r/min are different limits for NNU4980K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4980K skids at 940 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 940 r/min and oil 1,100 r/min are different limits for NNU4980K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1870/4300 kN ratings, 325 kN Pu and 84100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4980K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4980K?",
        "a": "NNU4980K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 400 mm bore, 540 mm OD and 140 mm width (15.748 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1870 kN, C0 4300 kN, Pu 325 kN, grease limiting speed 940 r/min, oil 1,100 r/min, mass about 84100 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4980K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4980K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4980K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4980K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4980 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4980K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 445 mm. The nominal bore/OD remain 400/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 940 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4980K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4980k",
      "NNU4980K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1080",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1080",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 2190,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 990,
    "max_rpm": 990,
    "speed_oil_rpm": 1200,
    "weight_g": 86300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N1080 on the 400×600 mm envelope, 90 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 990 r/min. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 400 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1080 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 3.6 kN-per-mm-bore figure (1460 kN over 400 mm) lets a N1080 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 86300 g N1080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1080 skids at 990 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace N1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1460/2190 kN ratings, 164 kN Pu and 86300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1080?",
        "a": "N1080 is an NTN N single-row cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 90 mm width (15.748 × 23.622 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 2190 kN, Pu 164 kN, grease limiting speed 990 r/min, oil 1,200 r/min, mass about 86300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1080 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1080 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1080?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 450 mm, Ew 550 mm. The nominal bore/OD remain 400/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 990 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1080",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1080",
      "N1080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1080",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1080",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 2190,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 990,
    "max_rpm": 990,
    "speed_oil_rpm": 1200,
    "weight_g": 86300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1080 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 400×600×90 mm ISO 15 envelope. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1080 floats or locates; the numeric remainder is the ISO 15 series and 400 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1080. The 400 mm (15.748 in) bore and 600 mm (23.622 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 90 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 400 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 86300 g NJ1080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 100.0 mm section at 400 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 90 mm-wide cavity.",
      "Do not replace NJ1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NJ1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 600 mm race brinells and releases as vibration within hours.",
      "The 1460/2190 kN ratings, 164 kN Pu and 86300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1080?",
        "a": "NJ1080 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 90 mm width (15.748 × 23.622 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 2190 kN, Pu 164 kN, grease limiting speed 990 r/min, oil 1,200 r/min, mass about 86300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1080 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1080 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1080?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 450 mm, Ew 550 mm. The nominal bore/OD remain 400/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 990 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1080-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1080",
      "NJ1080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3080",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3080",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2260,
    "static_load_kN": 4150,
    "fatigue_load_limit_kN": 310,
    "limiting_speed_rpm": 880,
    "max_rpm": 880,
    "speed_oil_rpm": 1000,
    "weight_g": 146000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3080 is the standard section of the NTN NN3000 dimension series for a 400 mm shaft — 2260 kN of basic dynamic capacity in a 146000 g, open bearing. Numbering ties NN3080 to its envelope: type code NN, series NN3000, 400 mm bore; the 600×148 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3080 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 310 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.84 (4150/2260 kN) shows the high-static-capacity proportioning of this 400 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3080.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 146000 g NN3080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN3080 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 400 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2260/4150 kN pair here belongs to NN3080 as printed, not to the bare size.",
      "The 148 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 400 mm inner ring.",
      "Do not replace NN3080 with a deep-groove ball bearing on rating alone: line contact gives 2260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2260/4150 kN ratings, 310 kN Pu and 146000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3080?",
        "a": "NN3080 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2260 kN, C0 4150 kN, Pu 310 kN, grease limiting speed 880 r/min, oil 1,000 r/min, mass about 146000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3080 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3080?",
        "a": "NN3080 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3080?",
        "a": "NTN rates NN3080 at 880 r/min with grease and 1,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3080",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3080",
      "NN3080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3080K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3080K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2260,
    "static_load_kN": 4150,
    "fatigue_load_limit_kN": 310,
    "limiting_speed_rpm": 880,
    "max_rpm": 880,
    "speed_oil_rpm": 1000,
    "weight_g": 141000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 400 mm shaft NTN supplies NN3080K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 880 r/min on grease and 1,000 r/min on oil. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3080K floats or locates; the numeric remainder is the ISO 15 series and 400 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3080K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 880 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,000 r/min for continuously high-duty 400 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 400 mm shaft.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 141000 g NN3080K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3080K skids at 880 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 880 r/min and oil 1,000 r/min are different limits for NN3080K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NN3080K with a deep-groove ball bearing on rating alone: line contact gives 2260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2260/4150 kN ratings, 310 kN Pu and 141000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3080K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3080K?",
        "a": "NN3080K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2260 kN, C0 4150 kN, Pu 310 kN, grease limiting speed 880 r/min, oil 1,000 r/min, mass about 141000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3080K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3080K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3080K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3080K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3080 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3080K?",
        "a": "NTN rates NN3080K at 880 r/min with grease and 1,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3080K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3080k",
      "NN3080K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1080",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1080",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 2190,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 990,
    "max_rpm": 990,
    "speed_oil_rpm": 1200,
    "weight_g": 86300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1080 is the extra-light (10/49) section of the NTN NU1000 dimension series for a 400 mm shaft — 1460 kN of basic dynamic capacity in a 86300 g, open bearing. Numbering ties NU1080 to its envelope: type code NU, series NU1000, 400 mm bore; the 600×90 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 990 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 400 mm bore. Thermal planning around the 990 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,200 r/min for continuously high-duty 400 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1080.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 86300 g NU1080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU1080 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NU1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NU1080 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1460/2190 kN ratings, 164 kN Pu and 86300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1080?",
        "a": "NU1080 is an NTN NU single-row cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 90 mm width (15.748 × 23.622 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 2190 kN, Pu 164 kN, grease limiting speed 990 r/min, oil 1,200 r/min, mass about 86300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1080 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1080 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1080?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 450 mm, Ew 550 mm. The nominal bore/OD remain 400/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 990 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1080-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1080",
      "NU1080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1080",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1080",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 2190,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 990,
    "max_rpm": 990,
    "speed_oil_rpm": 1200,
    "weight_g": 86300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1080 is the extra-light (10/49) section of the NTN NUP1000 dimension series for a 400 mm shaft — 1460 kN of basic dynamic capacity in a 86300 g, open bearing. Numbering ties NUP1080 to its envelope: type code NUP, series NUP1000, 400 mm bore; the 600×90 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NUP1080 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 990 r/min is .82 of the 1,200 r/min oil value for NUP1080; grease-churn heating closes that gap as fill quantity rises. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 400 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 86300 g NUP1080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP1080 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NUP1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NUP1080 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1460/2190 kN ratings, 164 kN Pu and 86300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1080?",
        "a": "NUP1080 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 90 mm width (15.748 × 23.622 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 2190 kN, Pu 164 kN, grease limiting speed 990 r/min, oil 1,200 r/min, mass about 86300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1080 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1080 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1080?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 450 mm, Ew 550 mm. The nominal bore/OD remain 400/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 990 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1080",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1080",
      "NUP1080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4984K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4984K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1930,
    "static_load_kN": 4500,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 87700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4984K is an NTN NNU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 420×560×140 mm ISO 15 envelope. Digit by digit, NNU4984K reads as NNU (double row, ribbed outer ring, separable inner), ISO 15 series, and bore 420 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Double-row NNU precision cylindrical roller bearing: ribbed outer ring with a separable inner ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Speed ratio check: limiting 900 r/min is .82 of the 1,100 r/min oil value for NNU4984K; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NNU4984K; an oversized radius locks the ring on its face and tilts the 140 mm-wide seat.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 87700 g NNU4984K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4984K skids at 900 r/min and fails by smearing long before L10 fatigue.",
      "Open NNU4984K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 420 mm contact.",
      "The 140 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 420 mm inner ring.",
      "The 1930/4500 kN ratings, 340 kN Pu and 87700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4984K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4984K?",
        "a": "NNU4984K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 420 mm bore, 560 mm OD and 140 mm width (16.535 × 22.047 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1930 kN, C0 4500 kN, Pu 340 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 87700 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4984K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4984K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4984K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4984K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4984 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4984K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 465 mm. The nominal bore/OD remain 420/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4984K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4984k",
      "NNU4984K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1084",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1084",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 89600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1084 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1500 kN dynamic rating in the 420 mm bore. Numbering ties N1084 to its envelope: type code N, series N1000, 420 mm bore; the 620×90 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N1084 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Housing and shaft fillets must clear the ring chamfers of N1084; an oversized radius locks the ring on its face and tilts the 90 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 89600 g N1084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for N1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The N rib arrangement is not interchangeable with another prefix on the same 420 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 620×90 mm envelope matches.",
      "The N rib arrangement is not interchangeable with another prefix on the same 420 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 620×90 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1500/2290 kN ratings, 170 kN Pu and 89600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1084?",
        "a": "N1084 is an NTN N single-row cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 90 mm width (16.535 × 24.409 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2290 kN, Pu 170 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 89600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1084 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1084 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1084?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 470 mm, Ew 570 mm. The nominal bore/OD remain 420/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1084",
      "N1084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1084",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1084",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 89600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 420 mm shaft NTN supplies NJ1084: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 950 r/min on grease and 1,100 r/min on oil. Digit by digit, NJ1084 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 420 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 950 r/min grease and 1,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 420 mm bore. Rating life at 1500 kN C assumes clean oil and adequate film; the 170 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 420 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 89600 g NJ1084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NJ1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NJ1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NJ1084 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1500/2290 kN ratings, 170 kN Pu and 89600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1084?",
        "a": "NJ1084 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 90 mm width (16.535 × 24.409 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2290 kN, Pu 170 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 89600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1084 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1084 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1084?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 470 mm, Ew 570 mm. The nominal bore/OD remain 420/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1084",
      "NJ1084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3084",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3084",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2300,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 320,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 990,
    "weight_g": 154000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3084 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 420×620×150 mm ISO 15 envelope. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3084 floats or locates; the numeric remainder is the ISO 15 series and 420 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3084 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 154000 g for the 420×620×150 mm NN3084 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 420 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 990 r/min need positive flow and drain design; the 154000 g NN3084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN3084 with a deep-groove ball bearing on rating alone: line contact gives 2300 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 150 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 420 mm inner ring.",
      "The 100.0 mm section at 420 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 150 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2300/4300 kN ratings, 320 kN Pu and 154000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3084?",
        "a": "NN3084 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 150 mm width (16.535 × 24.409 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2300 kN, C0 4300 kN, Pu 320 kN, grease limiting speed 840 r/min, oil 990 r/min, mass about 154000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3084 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3084?",
        "a": "NN3084 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3084?",
        "a": "NTN rates NN3084 at 840 r/min with grease and 990 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3084",
      "NN3084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3084K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3084K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2300,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 320,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 990,
    "weight_g": 148000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN3084K on the 420×620 mm envelope, 150 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 840 r/min. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 420 mm, with 620 mm OD and 150 mm width from the ISO 15 general plan. With C 2300 kN and C0 4300 kN (C0/C ≈ 1.87) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Housing and shaft fillets must clear the ring chamfers of NN3084K; an oversized radius locks the ring on its face and tilts the 150 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 990 r/min need positive flow and drain design; the 148000 g NN3084K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3084K skids at 840 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3084K skids at 840 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3084K skids at 840 r/min and fails by smearing long before L10 fatigue.",
      "The 2300/4300 kN ratings, 320 kN Pu and 148000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3084K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3084K?",
        "a": "NN3084K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 150 mm width (16.535 × 24.409 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2300 kN, C0 4300 kN, Pu 320 kN, grease limiting speed 840 r/min, oil 990 r/min, mass about 148000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3084K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3084K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3084K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3084K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3084 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3084K?",
        "a": "NTN rates NN3084K at 840 r/min with grease and 990 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3084K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3084k",
      "NN3084K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1084",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1084",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 89600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1084 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 420×620×90 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1084 floats or locates; the numeric remainder is the ISO 15 series and 420 mm bore reference, not a fit or clearance instruction. The 90 mm width and 100.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 170 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.53 (2290/1500 kN) shows the high-static-capacity proportioning of this 420 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 420 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 89600 g NU1084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 420 mm inner ring.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 420 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 620×90 mm envelope matches.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NU1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NU1084 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 420 mm contact.",
      "The 1500/2290 kN ratings, 170 kN Pu and 89600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1084?",
        "a": "NU1084 is an NTN NU single-row cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 90 mm width (16.535 × 24.409 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2290 kN, Pu 170 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 89600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1084 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1084 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1084?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 470 mm, Ew 570 mm. The nominal bore/OD remain 420/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1084-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1084",
      "NU1084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1084",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1084",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 89600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1084 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 420×620×90 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1084 floats or locates; the numeric remainder is the ISO 15 series and 420 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NUP1084 as a pure radial bearing: keep P below 1500 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 420 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 89600 g NUP1084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 420 mm inner ring.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NUP1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1500/2290 kN pair here belongs to NUP1084 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1500/2290 kN pair here belongs to NUP1084 as printed, not to the bare size.",
      "The 1500/2290 kN ratings, 170 kN Pu and 89600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1084?",
        "a": "NUP1084 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 90 mm width (16.535 × 24.409 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2290 kN, Pu 170 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 89600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1084 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1084 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1084?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 470 mm, Ew 570 mm. The nominal bore/OD remain 420/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1084",
      "NUP1084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4988K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4988K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2380,
    "static_load_kN": 5550,
    "fatigue_load_limit_kN": 410,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 121000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NNU4988K denotes a 440×600×160 mm (17.323 × 23.622 × 6.299 in) cylindrical roller bearing in the NNU4900 family, a machined or stamped steel cage per the precision execution. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 440 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NNU4988K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 850 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,000 r/min for continuously high-duty 440 mm positions. On NNU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 121000 g NNU4988K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 160 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 440 mm inner ring.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 440 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 600×160 mm envelope matches.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 440 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 600×160 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 440 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2380/5550 kN ratings, 410 kN Pu and 121000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4988K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4988K?",
        "a": "NNU4988K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 440 mm bore, 600 mm OD and 160 mm width (17.323 × 23.622 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2380 kN, C0 5550 kN, Pu 410 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 121000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4988K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4988K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4988K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4988K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4988 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4988K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 492 mm. The nominal bore/OD remain 440/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4988K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4988k",
      "NNU4988K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1088",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1088",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 94,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2430,
    "fatigue_load_limit_kN": 178,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1088 is the extra-light (10/49) section of the NTN N1000 dimension series for a 440 mm shaft — 1590 kN of basic dynamic capacity in a 103000 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N1088 floats or locates; the numeric remainder is the ISO 15 series and 440 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 900 r/min is .82 of the 1,100 r/min oil value for N1088; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 440 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 103000 g N1088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2430 kN pair here belongs to N1088 as printed, not to the bare size.",
      "Open N1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "Open N1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2430 kN pair here belongs to N1088 as printed, not to the bare size.",
      "The 1590/2430 kN ratings, 178 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1088?",
        "a": "N1088 is an NTN N single-row cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 94 mm width (17.323 × 25.591 × 3.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2430 kN, Pu 178 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 103000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1088 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1088 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1088?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 493 mm, Ew 597 mm. The nominal bore/OD remain 440/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1088",
      "N1088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1088",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1088",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 94,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2430,
    "fatigue_load_limit_kN": 178,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ1088 appears as a 440 mm bore single-row cylindrical roller bearing (1590 kN C / 2430 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 440 mm, with 650 mm OD and 94 mm width from the ISO 15 general plan. The 94 mm width and 105.0 mm section put the NJ1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 900 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,100 r/min for continuously high-duty 440 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1088.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 103000 g NJ1088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "If the shaft must be located both ways, do not use NJ1088 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NJ1088 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NJ1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "The 1590/2430 kN ratings, 178 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1088?",
        "a": "NJ1088 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 94 mm width (17.323 × 25.591 × 3.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2430 kN, Pu 178 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 103000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1088 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1088 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1088?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 493 mm, Ew 597 mm. The nominal bore/OD remain 440/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1088",
      "NJ1088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3088",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3088",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2680,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 370,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 940,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 440 mm shaft NTN supplies NN3088: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 800 r/min on grease and 940 r/min on oil. Digit by digit, NN3088 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 440 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 6.1 kN-per-mm-bore figure (2680 kN over 440 mm) lets a NN3088 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3088 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 940 r/min need positive flow and drain design; the 178000 g NN3088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3088 does not substitute a precision-class execution.",
      "The 105.0 mm section at 440 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 157 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 650 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2680/5100 kN pair here belongs to NN3088 as printed, not to the bare size.",
      "The 2680/5100 kN ratings, 370 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3088?",
        "a": "NN3088 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 157 mm width (17.323 × 25.591 × 6.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2680 kN, C0 5100 kN, Pu 370 kN, grease limiting speed 800 r/min, oil 940 r/min, mass about 178000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3088 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3088?",
        "a": "NN3088 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3088?",
        "a": "NTN rates NN3088 at 800 r/min with grease and 940 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3088",
      "NN3088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3088K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3088K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2680,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 370,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 940,
    "weight_g": 172000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3088K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 440×650×157 mm ISO 15 envelope. Numbering ties NN3088K to its envelope: type code NN, series NN3000, 440 mm bore; the 650×157 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 800 r/min grease and 940 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 440 mm bore. Rating life at 2680 kN C assumes clean oil and adequate film; the 370 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 940 r/min need positive flow and drain design; the 172000 g NN3088K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 157 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 440 mm inner ring.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 440 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 650×157 mm envelope matches.",
      "Open NN3088K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "The K tapered bore of NN3088K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The 2680/5100 kN ratings, 370 kN Pu and 172000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3088K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3088K?",
        "a": "NN3088K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 157 mm width (17.323 × 25.591 × 6.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2680 kN, C0 5100 kN, Pu 370 kN, grease limiting speed 800 r/min, oil 940 r/min, mass about 172000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3088K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3088K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3088K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3088K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3088 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3088K?",
        "a": "NTN rates NN3088K at 800 r/min with grease and 940 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3088K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3088k",
      "NN3088K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1088",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1088",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 94,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2430,
    "fatigue_load_limit_kN": 178,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 440 mm shaft NTN supplies NU1088: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 900 r/min on grease and 1,100 r/min on oil. Digit by digit, NU1088 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 440 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 105.0 mm radial section ((650−440)/2) frames the roller complement; capacity per millimetre of bore is about 3.6 kN/mm before application factors. Mass 103000 g for the 440×650×94 mm NU1088 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1088 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 103000 g NU1088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 650 mm race brinells and releases as vibration within hours.",
      "Open NU1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "If the shaft must be located both ways, do not use NU1088 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 105.0 mm section at 440 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 94 mm-wide cavity.",
      "The 1590/2430 kN ratings, 178 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1088?",
        "a": "NU1088 is an NTN NU single-row cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 94 mm width (17.323 × 25.591 × 3.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2430 kN, Pu 178 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 103000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1088 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1088 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1088?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 493 mm, Ew 597 mm. The nominal bore/OD remain 440/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1088",
      "NU1088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1088",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1088",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 94,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2430,
    "fatigue_load_limit_kN": 178,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 440 mm shaft NTN supplies NUP1088: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 900 r/min on grease and 1,100 r/min on oil. Digit by digit, NUP1088 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 440 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1590 kN and C0 2430 kN (C0/C ≈ 1.53) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 440 mm (17.323 in) bore and 650 mm (25.591 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 94 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1088.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 103000 g NUP1088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 650 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NUP1088 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 94 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 440 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1088 skids at 900 r/min and fails by smearing long before L10 fatigue.",
      "The 1590/2430 kN ratings, 178 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1088?",
        "a": "NUP1088 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 94 mm width (17.323 × 25.591 × 3.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2430 kN, Pu 178 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 103000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1088 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1088 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1088?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 493 mm, Ew 597 mm. The nominal bore/OD remain 440/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1088",
      "NUP1088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4992K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4992K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2460,
    "static_load_kN": 5850,
    "fatigue_load_limit_kN": 430,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 950,
    "weight_g": 126000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4992K is the extra-light (10/49) section of the NTN NNU4900 dimension series for a 460 mm shaft — 2460 kN of basic dynamic capacity in a 126000 g, open bearing. Digit by digit, NNU4992K reads as NNU (double row, ribbed outer ring, separable inner), ISO 15 series, and bore 460 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 80.0 mm radial section ((620−460)/2) frames the roller complement; capacity per millimetre of bore is about 5.3 kN/mm before application factors. The 460 mm (18.11 in) bore and 620 mm (24.409 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 160 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 460 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 950 r/min need positive flow and drain design; the 126000 g NNU4992K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NNU4992K with a deep-groove ball bearing on rating alone: line contact gives 2460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 800 r/min and oil 950 r/min are different limits for NNU4992K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 80.0 mm section at 460 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 160 mm-wide cavity.",
      "The 2460/5850 kN ratings, 430 kN Pu and 126000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4992K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4992K?",
        "a": "NNU4992K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 460 mm bore, 620 mm OD and 160 mm width (18.11 × 24.409 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2460 kN, C0 5850 kN, Pu 430 kN, grease limiting speed 800 r/min, oil 950 r/min, mass about 126000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4992K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4992K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4992K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4992K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4992 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4992K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 512 mm. The nominal bore/OD remain 460/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 800 r/min grease / 950 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4992K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4992k",
      "NNU4992K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1092",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1092",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1092 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 460×680×100 mm ISO 15 envelope. Numbering ties N1092 to its envelope: type code N, series N1000, 460 mm bore; the 680×100 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N1092 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 850 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,000 r/min for continuously high-duty 460 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 460 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 120000 g N1092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N1092 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1092 skids at 850 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1710/2630 kN ratings, 191 kN Pu and 120000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1092?",
        "a": "N1092 is an NTN N single-row cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 100 mm width (18.11 × 26.772 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2630 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 120000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1092 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1092 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1092?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 516 mm, Ew 624 mm. The nominal bore/OD remain 460/680 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1092",
      "N1092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1092",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1092",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ1092 denotes a 460×680×100 mm (18.11 × 26.772 × 3.937 in) cylindrical roller bearing in the NJ1000 family, a pressed sheet-steel cage. Digit by digit, NJ1092 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 460 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 850 r/min grease and 1,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 460 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1092.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 120000 g NJ1092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 460 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 680×100 mm envelope matches.",
      "Do not replace NJ1092 with a deep-groove ball bearing on rating alone: line contact gives 1710 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1710/2630 kN pair here belongs to NJ1092 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NJ1092 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1710/2630 kN ratings, 191 kN Pu and 120000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1092?",
        "a": "NJ1092 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 100 mm width (18.11 × 26.772 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2630 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 120000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1092 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1092 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1092?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 516 mm, Ew 624 mm. The nominal bore/OD remain 460/680 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1092",
      "NJ1092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3092",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3092",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 5350,
    "fatigue_load_limit_kN": 385,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 890,
    "weight_g": 202000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3092 appears as a 460 mm bore single-row cylindrical roller bearing (2830 kN C / 5350 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3092 floats or locates; the numeric remainder is the ISO 15 series and 460 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3092 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 460 mm (18.11 in) bore and 680 mm (26.772 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 163 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3092 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 890 r/min need positive flow and drain design; the 202000 g NN3092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 750 r/min and oil 890 r/min are different limits for NN3092: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2830/5350 kN pair here belongs to NN3092 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2830/5350 kN ratings, 385 kN Pu and 202000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3092?",
        "a": "NN3092 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 163 mm width (18.11 × 26.772 × 6.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 5350 kN, Pu 385 kN, grease limiting speed 750 r/min, oil 890 r/min, mass about 202000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3092 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3092?",
        "a": "NN3092 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3092?",
        "a": "NTN rates NN3092 at 750 r/min with grease and 890 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3092",
      "NN3092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3092K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3092K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 5350,
    "fatigue_load_limit_kN": 385,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 890,
    "weight_g": 195000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3092K denotes a 460×680×163 mm (18.11 × 26.772 × 6.417 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 460 mm, with 680 mm OD and 163 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NN3092K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 750 r/min is .84 of the 890 r/min oil value for NN3092K; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3092K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 890 r/min need positive flow and drain design; the 195000 g NN3092K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN3092K with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 750 r/min and oil 890 r/min are different limits for NN3092K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NN3092K with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2830/5350 kN ratings, 385 kN Pu and 195000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3092K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3092K?",
        "a": "NN3092K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 163 mm width (18.11 × 26.772 × 6.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 5350 kN, Pu 385 kN, grease limiting speed 750 r/min, oil 890 r/min, mass about 195000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3092K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3092K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3092K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3092K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3092 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3092K?",
        "a": "NTN rates NN3092K at 750 r/min with grease and 890 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3092K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3092k",
      "NN3092K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1092",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1092",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU1092 appears as a 460 mm bore single-row cylindrical roller bearing (1710 kN C / 2630 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1092 floats or locates; the numeric remainder is the ISO 15 series and 460 mm bore reference, not a fit or clearance instruction. The 100 mm width and 110.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NU1092 as a pure radial bearing: keep P below 1710 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1092 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 120000 g NU1092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 460 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1710/2630 kN pair here belongs to NU1092 as printed, not to the bare size.",
      "Open NU1092 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 460 mm contact.",
      "The 1710/2630 kN ratings, 191 kN Pu and 120000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1092?",
        "a": "NU1092 is an NTN NU single-row cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 100 mm width (18.11 × 26.772 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2630 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 120000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1092 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1092 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1092?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 516 mm, Ew 624 mm. The nominal bore/OD remain 460/680 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1092-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1092",
      "NU1092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1092",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1092",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP1092 appears as a 460 mm bore single-row cylindrical roller bearing (1710 kN C / 2630 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1092 floats or locates; the numeric remainder is the ISO 15 series and 460 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 120000 g for the 460×680×100 mm NUP1092 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1092.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 120000 g NUP1092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 460 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "Do not replace NUP1092 with a deep-groove ball bearing on rating alone: line contact gives 1710 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 110.0 mm section at 460 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1710/2630 kN pair here belongs to NUP1092 as printed, not to the bare size.",
      "The 1710/2630 kN ratings, 191 kN Pu and 120000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1092?",
        "a": "NUP1092 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 100 mm width (18.11 × 26.772 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2630 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 120000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1092 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1092 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1092?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 516 mm, Ew 624 mm. The nominal bore/OD remain 460/680 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1092",
      "NUP1092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4996K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4996K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2530,
    "static_load_kN": 5900,
    "fatigue_load_limit_kN": 425,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 149000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NNU4996K appears as a 480 mm bore single-row cylindrical roller bearing (2530 kN C / 5900 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 480 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 534 mm — the envelope inside the 480/650 mm bore/OD where the rollers actually run. Mass 149000 g for the 480×650×170 mm NNU4996K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NNU4996K.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 149000 g NNU4996K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 480 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 650×170 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4996K skids at 770 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 650 mm race brinells and releases as vibration within hours.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 480 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 650×170 mm envelope matches.",
      "The 2530/5900 kN ratings, 425 kN Pu and 149000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4996K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4996K?",
        "a": "NNU4996K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 480 mm bore, 650 mm OD and 170 mm width (18.898 × 25.591 × 6.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2530 kN, C0 5900 kN, Pu 425 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 149000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4996K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4996K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4996K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4996K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4996 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4996K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 534 mm. The nominal bore/OD remain 480/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4996K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4996k",
      "NNU4996K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1096",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1096",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1750,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 197,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 960,
    "weight_g": 124000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 480 mm shaft NTN supplies N1096: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 810 r/min on grease and 960 r/min on oil. On the NTN nameplate N states which ring carries the ribs, which determines whether N1096 floats or locates; the numeric remainder is the ISO 15 series and 480 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 197 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.57 (2750/1750 kN) shows the high-static-capacity proportioning of this 480 mm bore. Heat the inner ring to max 120 °C for the 480 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 960 r/min need positive flow and drain design; the 124000 g N1096 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 480 mm inner ring.",
      "The N rib arrangement is not interchangeable with another prefix on the same 480 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 700×100 mm envelope matches.",
      "Do not replace N1096 with a deep-groove ball bearing on rating alone: line contact gives 1750 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1750/2750 kN pair here belongs to N1096 as printed, not to the bare size.",
      "The 1750/2750 kN ratings, 197 kN Pu and 124000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1096 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1096?",
        "a": "N1096 is an NTN N single-row cylindrical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 100 mm width (18.898 × 27.559 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 2750 kN, Pu 197 kN, grease limiting speed 810 r/min, oil 960 r/min, mass about 124000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1096 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1096 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1096 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1096?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 536 mm, Ew 644 mm. The nominal bore/OD remain 480/700 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 810 r/min grease / 960 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1096",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1096",
      "N1096"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1096",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1096",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1750,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 197,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 960,
    "weight_g": 124000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ1096 on the 480×700 mm envelope, 100 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 810 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 480 mm, with 700 mm OD and 100 mm width from the ISO 15 general plan. The 100 mm width and 110.0 mm section put the NJ1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 810 r/min is .84 of the 960 r/min oil value for NJ1096; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 480 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 960 r/min need positive flow and drain design; the 124000 g NJ1096 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1096 skids at 810 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 810 r/min and oil 960 r/min are different limits for NJ1096: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 480 mm inner ring.",
      "Open NJ1096 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 480 mm contact.",
      "The 1750/2750 kN ratings, 197 kN Pu and 124000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1096 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1096?",
        "a": "NJ1096 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 100 mm width (18.898 × 27.559 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 2750 kN, Pu 197 kN, grease limiting speed 810 r/min, oil 960 r/min, mass about 124000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1096 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1096 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1096 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1096?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 536 mm, Ew 644 mm. The nominal bore/OD remain 480/700 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 810 r/min grease / 960 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1096",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1096",
      "NJ1096"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1096",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1096",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1750,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 197,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 960,
    "weight_g": 124000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU1096 denotes a 480×700×100 mm (18.898 × 27.559 × 3.937 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. Digit by digit, NU1096 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 480 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 110.0 mm radial section ((700−480)/2) frames the roller complement; capacity per millimetre of bore is about 3.6 kN/mm before application factors. The 480 mm (18.898 in) bore and 700 mm (27.559 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 100 mm-wide ring. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 960 r/min need positive flow and drain design; the 124000 g NU1096 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 480 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 480 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 700×100 mm envelope matches.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 480 mm inner ring.",
      "The 110.0 mm section at 480 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The 1750/2750 kN ratings, 197 kN Pu and 124000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1096 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1096?",
        "a": "NU1096 is an NTN NU single-row cylindrical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 100 mm width (18.898 × 27.559 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 2750 kN, Pu 197 kN, grease limiting speed 810 r/min, oil 960 r/min, mass about 124000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1096 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1096 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1096 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1096?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 536 mm, Ew 644 mm. The nominal bore/OD remain 480/700 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 810 r/min grease / 960 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1096-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1096",
      "NU1096"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1096",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1096",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1750,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 197,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 960,
    "weight_g": 124000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP1096 denotes a 480×700×100 mm (18.898 × 27.559 × 3.937 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. Digit by digit, NUP1096 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 480 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1750 kN and C0 2750 kN (C0/C ≈ 1.57) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 3.6 kN-per-mm-bore figure (1750 kN over 480 mm) lets a NUP1096 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 480 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 960 r/min need positive flow and drain design; the 124000 g NUP1096 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 480 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 810 r/min and oil 960 r/min are different limits for NUP1096: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 700 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1096 skids at 810 r/min and fails by smearing long before L10 fatigue.",
      "The 1750/2750 kN ratings, 197 kN Pu and 124000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1096 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1096?",
        "a": "NUP1096 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 100 mm width (18.898 × 27.559 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 2750 kN, Pu 197 kN, grease limiting speed 810 r/min, oil 960 r/min, mass about 124000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1096 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1096 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1096 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1096?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 536 mm, Ew 644 mm. The nominal bore/OD remain 480/700 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 810 r/min grease / 960 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1096",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1096",
      "NUP1096"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU49-500K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU49/500K",
    "series": "NNU50000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2670,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 455,
    "limiting_speed_rpm": 730,
    "max_rpm": 730,
    "speed_oil_rpm": 860,
    "weight_g": 155000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU49/500K is an NTN NNU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 500×670×170 mm ISO 15 envelope. Numbering ties NNU49/500K to its envelope: type code NNU, series NNU50000, 500 mm bore; the 670×170 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NNU49/500K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 730 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 860 r/min for continuously high-duty 500 mm positions. Housing and shaft fillets must clear the ring chamfers of NNU49/500K; an oversized radius locks the ring on its face and tilts the 170 mm-wide seat.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 860 r/min need positive flow and drain design; the 155000 g NNU49/500K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 500 mm bore share bore but not OD/width; check the full NNU50000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 500 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 670×170 mm envelope matches.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 500 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 670×170 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 500 mm bore share bore but not OD/width; check the full NNU50000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2670/6400 kN ratings, 455 kN Pu and 155000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU49/500K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU49/500K?",
        "a": "NNU49/500K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 500 mm bore, 670 mm OD and 170 mm width (19.685 × 26.378 × 6.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2670 kN, C0 6400 kN, Pu 455 kN, grease limiting speed 730 r/min, oil 860 r/min, mass about 155000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU49/500K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU49/500K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU49/500K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU49/500K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU49/500 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU49/500K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm. The nominal bore/OD remain 500/670 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 730 r/min grease / 860 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU49",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu49-500k",
      "NNU49-500K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N10-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN N10/500",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2870,
    "fatigue_load_limit_kN": 203,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 128000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N10/500 is the extra-light (10/49) section of the NTN N1000 dimension series for a 500 mm shaft — 1790 kN of basic dynamic capacity in a 128000 g, open bearing. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 500 mm (00–03 use the 10/12/15/17 exception table); slash sizes like this one print the bore directly after the slash. With C 1790 kN and C0 2870 kN (C0/C ≈ 1.60) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Speed ratio check: limiting 770 r/min is .85 of the 910 r/min oil value for N10/500; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 500 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 128000 g N10/500 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 770 r/min and oil 910 r/min are different limits for N10/500: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open N10/500 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 500 mm contact.",
      "Grease limiting speed 770 r/min and oil 910 r/min are different limits for N10/500: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N10/500 skids at 770 r/min and fails by smearing long before L10 fatigue.",
      "The 1790/2870 kN ratings, 203 kN Pu and 128000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N10/500 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N10/500?",
        "a": "N10/500 is an NTN N single-row cylindrical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 100 mm width (19.685 × 28.346 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2870 kN, Pu 203 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 128000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N10/500 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N10/500 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N10/500 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N10/500?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm, Ew 664 mm. The nominal bore/OD remain 500/720 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N10",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n10-500",
      "N10-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ10-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ10/500",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2870,
    "fatigue_load_limit_kN": 203,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 128000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ10/500 appears as a 500 mm bore single-row cylindrical roller bearing (1790 kN C / 2870 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NJ10/500 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 500 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 556 mm and Ew 664 mm — the envelope inside the 500/720 mm bore/OD where the rollers actually run. Mass 128000 g for the 500×720×100 mm NJ10/500 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ10/500 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 128000 g NJ10/500 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 500 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 720×100 mm envelope matches.",
      "The 110.0 mm section at 500 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The 110.0 mm section at 500 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 500 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 720×100 mm envelope matches.",
      "The 1790/2870 kN ratings, 203 kN Pu and 128000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ10/500 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ10/500?",
        "a": "NJ10/500 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 100 mm width (19.685 × 28.346 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2870 kN, Pu 203 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 128000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ10/500 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ10/500 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ10/500 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ10/500?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm, Ew 664 mm. The nominal bore/OD remain 500/720 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ10",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj10-500",
      "NJ10-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU10-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU10/500",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2870,
    "fatigue_load_limit_kN": 203,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 128000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 500 mm shaft NTN supplies NU10/500: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 770 r/min on grease and 910 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU10/500 floats or locates; the numeric remainder is the ISO 15 series and 500 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Speed ratio check: limiting 770 r/min is .85 of the 910 r/min oil value for NU10/500; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU10/500.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 128000 g NU10/500 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 770 r/min and oil 910 r/min are different limits for NU10/500: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 770 r/min and oil 910 r/min are different limits for NU10/500: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1790/2870 kN pair here belongs to NU10/500 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1790/2870 kN pair here belongs to NU10/500 as printed, not to the bare size.",
      "The 1790/2870 kN ratings, 203 kN Pu and 128000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU10/500 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU10/500?",
        "a": "NU10/500 is an NTN NU single-row cylindrical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 100 mm width (19.685 × 28.346 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2870 kN, Pu 203 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 128000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU10/500 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU10/500 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU10/500 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU10/500?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm, Ew 664 mm. The nominal bore/OD remain 500/720 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU10-500-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU10-530-MA",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      },
      {
        "equiv_sku": "NU10-560-MA",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      },
      {
        "equiv_sku": "NU10-600-MA",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      },
      {
        "equiv_sku": "NU10-710-ECMA",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      },
      {
        "equiv_sku": "NU10-750-ECMA-HB1",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu10-500",
      "NU10-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP10-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP10/500",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2870,
    "fatigue_load_limit_kN": 203,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 128000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP10/500 denotes a 500×720×100 mm (19.685 × 28.346 × 3.937 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 500 mm, with 720 mm OD and 100 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 770 r/min grease and 910 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 500 mm bore. The 3.6 kN-per-mm-bore figure (1790 kN over 500 mm) lets a NUP10/500 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 500 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 128000 g NUP10/500 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP10/500 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 500 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1790/2870 kN pair here belongs to NUP10/500 as printed, not to the bare size.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 500 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 720×100 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP10/500 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1790/2870 kN ratings, 203 kN Pu and 128000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP10/500 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP10/500?",
        "a": "NUP10/500 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 100 mm width (19.685 × 28.346 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2870 kN, Pu 203 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 128000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP10/500 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP10/500 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP10/500 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP10/500?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm, Ew 664 mm. The nominal bore/OD remain 500/720 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP10",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup10-500",
      "NUP10-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU204",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 28.5,
    "static_load_kN": 22,
    "fatigue_load_limit_kN": 2.75,
    "max_rpm": 19000,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 19000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 204 ECP",
    "naming_rule_text": "SKF NU204 (NU 204 ECP) is the standard cylindrical roller choice for a 20 mm shaft — one row of precisely profiled rollers on ground raceways inside the 47×14 mm ISO 15 envelope. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 2 (the standard), and bore code 04 = 20 mm; dimensions 20×47×14 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 28.5 kN and C0 22 kN, the NU204 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.",
    "applications": [
      "machine-tool spindle support (radial set)",
      "agricultural machinery power-take-off shafts",
      "automotive alternator and starter shafts",
      "small conveyor drum bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At a 20 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU204 develops edge loading and early spalling.",
      "The NU200 series at 20 mm bore (47×14 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The NU204 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 47 mm race release as noise within the first running hours.",
      "The 28.5/22 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU204 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 204 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU204?",
        "a": "The NU 204 ECP is a single-row cylindrical roller bearing with 20 mm bore, 47 mm outer diameter and 14 mm width (0.787 × 1.85 × 0.551 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 28.5 kN, C0 22 kN, fatigue load limit Pu 2.75 kN, reference speed 17,000 r/min, limiting speed 19,000 r/min, mass about 110 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU204 bore code work?",
        "a": "The last two digits of NU204 are bore code 04, so 04 × 5 = 20 mm bore. The 47 mm OD and 14 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU204?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU204 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU204 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6204",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6204-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6204-RSR",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6204-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N204-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 204 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ204-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 204 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP204-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 204 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU204 ECP",
      "NU204 ECP"
    ]
  },
  {
    "sku": "NU205",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 27,
    "fatigue_load_limit_kN": 3.35,
    "max_rpm": 16000,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 16000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 205 ECP",
    "naming_rule_text": "Ordering number NU 205 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 25 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 2 is the ISO 15 diameter/width series (standard), and the last two digits encode the 25 mm bore; the 52 mm OD and 15 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 3.35 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.83 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. The outer ring has no ribs and cannot locate the shaft axially; pair NU205 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "automotive alternator and starter shafts",
      "small conveyor drum bearings",
      "small electric-motor armature shafts",
      "light-duty gearbox intermediate shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At a 25 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU205 develops edge loading and early spalling.",
      "The NU200 series at 25 mm bore (52×15 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Catalogue reference speed and limiting speed are different limits: the 15,000 r/min reference is a thermal criterion under load, while the 16,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 32.5/27 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU205 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 205 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU205?",
        "a": "The NU 205 ECP is a single-row cylindrical roller bearing with 25 mm bore, 52 mm outer diameter and 15 mm width (0.984 × 2.047 × 0.591 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 32.5 kN, C0 27 kN, fatigue load limit Pu 3.35 kN, reference speed 15,000 r/min, limiting speed 16,000 r/min, mass about 130 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU205 bore code work?",
        "a": "The last two digits of NU205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 15 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU205?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU205 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU205 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6205",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6205-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6205-RSR",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6205-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 205 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 205 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 205 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU205 ECP",
      "NU205 ECP"
    ]
  },
  {
    "sku": "NU206",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 44,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 4.5,
    "max_rpm": 14000,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 14000,
    "weight_g": 200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 206 ECP",
    "naming_rule_text": "NU206 is a single-row cylindrical roller bearing in the NU200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, NU206 reads as bearing type NU (single-row, inner ring separable), standard series 2, and bore reference 06 resolving to 30 mm; 62 mm OD and 16 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 0.83 (static 36.5 kN against dynamic 44 kN), typical of a cylindrical roller sized for high radial capacity, and the 4.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 30 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "industrial gearbox input/output shafts",
      "pump and compressor drive shafts",
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "On this 30 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU200 series at 30 mm bore (62×16 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The 200 g mass and 16 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU206.",
      "Open NU206 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The 44/36.5 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU206 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 206 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU206?",
        "a": "The NU 206 ECP is a single-row cylindrical roller bearing with 30 mm bore, 62 mm outer diameter and 16 mm width (1.181 × 2.441 × 0.63 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 44 kN, C0 36.5 kN, fatigue load limit Pu 4.5 kN, reference speed 13,000 r/min, limiting speed 14,000 r/min, mass about 200 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU206 bore code work?",
        "a": "The last two digits of NU206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 16 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU206?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU206 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU206 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6206",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6206-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6206-RSR",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6206-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 206 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 206 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 206 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU206 ECP",
      "NU206 ECP"
    ]
  },
  {
    "sku": "NU207",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 56,
    "static_load_kN": 48,
    "fatigue_load_limit_kN": 6.1,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 207 ECP",
    "naming_rule_text": "The NU 207 ECP is a 35×72×17 mm single-row cylindrical roller bearing — the standard entry in the NU200 series, with separable inner ring and roller assembly for easy mounting. Numbering ties the bearing to its envelope: NU207 means cylindrical-roller type NU, standard series 2, 35 mm bore — which is why the 72×17 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 18.5 mm radial section height ((72−35)/2) and 290 g catalogue mass frame a 35 mm bore bearing rated at 56 kN C — roughly 1.60 kN of dynamic capacity per millimetre of bore before application factors. For a 35 mm shaft the usual inner-ring seat is k5 with an H7 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "On this 35 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU200 series at 35 mm bore (72×17 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 72 mm race release as noise within the first running hours.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "The 56/48 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU207 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 207 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU207?",
        "a": "The NU 207 ECP is a single-row cylindrical roller bearing with 35 mm bore, 72 mm outer diameter and 17 mm width (1.378 × 2.835 × 0.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 56 kN, C0 48 kN, fatigue load limit Pu 6.1 kN, reference speed 11,000 r/min, limiting speed 12,000 r/min, mass about 290 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU207 bore code work?",
        "a": "The last two digits of NU207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 17 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU207?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU207 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU207 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6207",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6207-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6207-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 207 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 207 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 207 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU207 ECP",
      "NU207 ECP"
    ]
  },
  {
    "sku": "NU208",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 62,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 6.7,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 208 ECP",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU208 appears as NU 208 ECP: an open, single-row cylindrical roller bearing in the NU200 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. On the SKF nameplate, NU208 follows the ISO 15 convention: NU for the separable-inner-ring type, 2 for the standard, final digits 08 for the 40 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 370 g for the 40×80×18 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.",
    "applications": [
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 40 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU200 series at 40 mm bore (80×18 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Catalogue reference speed and limiting speed are different limits: the 9,500 r/min reference is a thermal criterion under load, while the 11,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The NU208 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The 62/53 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU208 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 208 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU208?",
        "a": "The NU 208 ECP is a single-row cylindrical roller bearing with 40 mm bore, 80 mm outer diameter and 18 mm width (1.575 × 3.15 × 0.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 62 kN, C0 53 kN, fatigue load limit Pu 6.7 kN, reference speed 9,500 r/min, limiting speed 11,000 r/min, mass about 370 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU208 bore code work?",
        "a": "The last two digits of NU208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 18 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU208?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU208 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU208 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6208",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6208-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6208-RSR",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6208-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 208 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 208 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 208 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU208 ECP",
      "NU208 ECP"
    ]
  },
  {
    "sku": "NU209",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 8.15,
    "max_rpm": 9500,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 9500,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 209 ECP",
    "naming_rule_text": "NU 209 ECP belongs to the SKF single-row cylindrical roller range — the 45 mm bore entry in the NU200 series, dimensioned 85 mm OD and 19 mm wide to the ISO 15 boundary plan. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 2 (the standard), and bore code 09 = 45 mm; dimensions 45×85×19 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 9,000 r/min reference speed the 20.0 mm-section NU209 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 9,500 r/min as the mechanical ceiling. Because the inner ring is separable, heat the inner ring (max 120 °C for the polymer cage) and mount it onto the shaft before inserting the outer ring; do not drive the rollers through the raceways during assembly.",
    "applications": [
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts",
      "pump and compressor drive shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "On this 45 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU200 series at 45 mm bore (85×19 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Open NU209 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "Shaft and housing fillets must clear the bearing chamfer so the 19 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 69.5/64 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU209 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 209 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU209?",
        "a": "The NU 209 ECP is a single-row cylindrical roller bearing with 45 mm bore, 85 mm outer diameter and 19 mm width (1.772 × 3.346 × 0.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 69.5 kN, C0 64 kN, fatigue load limit Pu 8.15 kN, reference speed 9,000 r/min, limiting speed 9,500 r/min, mass about 420 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU209 bore code work?",
        "a": "The last two digits of NU209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 19 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU209?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU209 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU209 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6209",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6209-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6209-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 209 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 209 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 209 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU209 ECP",
      "NU209 ECP"
    ]
  },
  {
    "sku": "NU210",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 8.8,
    "max_rpm": 9000,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 9000,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 210 ECP",
    "naming_rule_text": "For a 50 mm shaft carrying pure radial load, SKF lists NU210 under catalogue execution NU 210 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Numbering ties the bearing to its envelope: NU210 means cylindrical-roller type NU, standard series 2, 50 mm bore — which is why the 90×20 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 73.5 kN and C0 69.5 kN, the NU210 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 50 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "On this 50 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU200 series at 50 mm bore (90×20 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Open NU210 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The NU210 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The 73.5/69.5 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU210 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 210 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU210?",
        "a": "The NU 210 ECP is a single-row cylindrical roller bearing with 50 mm bore, 90 mm outer diameter and 20 mm width (1.969 × 3.543 × 0.787 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 73.5 kN, C0 69.5 kN, fatigue load limit Pu 8.8 kN, reference speed 8,500 r/min, limiting speed 9,000 r/min, mass about 470 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU210 bore code work?",
        "a": "The last two digits of NU210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 20 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU210?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU210 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU210 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6210",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6210-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6210-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 210 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 210 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 210 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU210 ECP",
      "NU210 ECP"
    ]
  },
  {
    "sku": "NU211",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 96.5,
    "static_load_kN": 95,
    "fatigue_load_limit_kN": 12.2,
    "max_rpm": 8000,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8000,
    "weight_g": 660,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 211 ECP",
    "naming_rule_text": "SKF NU211 (NU 211 ECP) is the standard cylindrical roller choice for a 55 mm shaft — one row of precisely profiled rollers on ground raceways inside the 100×21 mm ISO 15 envelope. On the SKF nameplate, NU211 follows the ISO 15 convention: NU for the separable-inner-ring type, 2 for the standard, final digits 11 for the 55 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 12.2 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.98 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. For a 55 mm shaft the usual inner-ring seat is k5 with an H6 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.",
    "applications": [
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "On this 55 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU200 series at 55 mm bore (100×21 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 96.5/95 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU211 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 211 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU211?",
        "a": "The NU 211 ECP is a single-row cylindrical roller bearing with 55 mm bore, 100 mm outer diameter and 21 mm width (2.165 × 3.937 × 0.827 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 96.5 kN, C0 95 kN, fatigue load limit Pu 12.2 kN, reference speed 7,500 r/min, limiting speed 8,000 r/min, mass about 660 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU211 bore code work?",
        "a": "The last two digits of NU211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 21 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU211?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU211 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU211 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6211",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6211-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6211-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 211 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 211 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 211 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU211 ECP",
      "NU211 ECP"
    ]
  },
  {
    "sku": "NU212",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 108,
    "static_load_kN": 102,
    "fatigue_load_limit_kN": 13.4,
    "max_rpm": 7500,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 7500,
    "weight_g": 800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 212 ECP",
    "naming_rule_text": "Ordering number NU 212 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 60 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 2 (the standard), and bore code 12 = 60 mm; dimensions 60×110×22 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 0.94 (static 102 kN against dynamic 108 kN), typical of a cylindrical roller sized for high radial capacity, and the 13.4 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.",
    "applications": [
      "heavy industrial gearbox shafts",
      "large pump and turbine shafts",
      "rolling-mill work-roll backup bearings",
      "paper-machine dryer and calender rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Mount the 60 mm bore NU212 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU200 series at 60 mm bore (110×22 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The NU212 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The 800 g mass and 22 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU212.",
      "The 108/102 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU212 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 212 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU212?",
        "a": "The NU 212 ECP is a single-row cylindrical roller bearing with 60 mm bore, 110 mm outer diameter and 22 mm width (2.362 × 4.331 × 0.866 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 108 kN, C0 102 kN, fatigue load limit Pu 13.4 kN, reference speed 6,700 r/min, limiting speed 7,500 r/min, mass about 800 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU212 bore code work?",
        "a": "The last two digits of NU212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 22 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU212?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU212 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU212 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6212",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6212-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6212-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 212 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 212 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 212 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU212 ECP",
      "NU212 ECP"
    ]
  },
  {
    "sku": "NU213",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 122,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 15.6,
    "max_rpm": 6700,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6700,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 213 ECP",
    "naming_rule_text": "NU213 is a single-row cylindrical roller bearing in the NU200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 2 is the ISO 15 diameter/width series (standard), and the last two digits encode the 65 mm bore; the 120 mm OD and 23 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 27.5 mm radial section height ((120−65)/2) and 1000 g catalogue mass frame a 65 mm bore bearing rated at 122 kN C — roughly 1.88 kN of dynamic capacity per millimetre of bore before application factors. Because the inner ring is separable, heat the inner ring (max 120 °C for the polymer cage) and mount it onto the shaft before inserting the outer ring; do not drive the rollers through the raceways during assembly.",
    "applications": [
      "rolling-mill work-roll backup bearings",
      "paper-machine dryer and calender rolls",
      "cement-kiln support-roller shafts",
      "wind-turbine gearbox intermediate shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 65 mm bore NU213 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU200 series at 65 mm bore (120×23 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 120 mm race release as noise within the first running hours.",
      "The 122/118 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU213 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 213 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU213?",
        "a": "The NU 213 ECP is a single-row cylindrical roller bearing with 65 mm bore, 120 mm outer diameter and 23 mm width (2.559 × 4.724 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 122 kN, C0 118 kN, fatigue load limit Pu 15.6 kN, reference speed 6,300 r/min, limiting speed 6,700 r/min, mass about 1000 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU213 bore code work?",
        "a": "The last two digits of NU213 are bore code 13, so 13 × 5 = 65 mm bore. The 120 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU213?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU213 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU213 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU213-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6213",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6213-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N213-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 213 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ213-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 213 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP213-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 213 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU213 ECP",
      "NU213 ECP"
    ]
  },
  {
    "sku": "NU214",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 137,
    "static_load_kN": 137,
    "fatigue_load_limit_kN": 18,
    "max_rpm": 6300,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 214 ECP",
    "naming_rule_text": "The NU 214 ECP is a 70×125×24 mm single-row cylindrical roller bearing — the standard entry in the NU200 series, with separable inner ring and roller assembly for easy mounting. Digit by digit, NU214 reads as bearing type NU (single-row, inner ring separable), standard series 2, and bore reference 14 resolving to 70 mm; 125 mm OD and 24 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 1150 g for the 70×125×24 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. Mount the separable inner ring + roller assembly onto the shaft first, then slide the outer ring into the housing; the NU design has no outer-ring ribs, so axial location of the shaft must be provided by adjacent components or a second bearing.",
    "applications": [
      "cement-kiln support-roller shafts",
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 70 mm bore NU214 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU200 series at 70 mm bore (125×24 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The 1150 g mass and 24 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU214.",
      "Catalogue reference speed and limiting speed are different limits: the 6,000 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.",
      "The 137/137 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU214 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 214 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU214?",
        "a": "The NU 214 ECP is a single-row cylindrical roller bearing with 70 mm bore, 125 mm outer diameter and 24 mm width (2.756 × 4.921 × 0.945 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 137 kN, C0 137 kN, fatigue load limit Pu 18 kN, reference speed 6,000 r/min, limiting speed 6,300 r/min, mass about 1150 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU214 bore code work?",
        "a": "The last two digits of NU214 are bore code 14, so 14 × 5 = 70 mm bore. The 125 mm OD and 24 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU214?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU214 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU214 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU214-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6214",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6214-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6214-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N214-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 214 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ214-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 214 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP214-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 214 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU214 ECP",
      "NU214 ECP"
    ]
  },
  {
    "sku": "NU215",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 150,
    "static_load_kN": 156,
    "fatigue_load_limit_kN": 20.4,
    "max_rpm": 6000,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6000,
    "weight_g": 1250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 215 ECP",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU215 appears as NU 215 ECP: an open, single-row cylindrical roller bearing in the NU200 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. Numbering ties the bearing to its envelope: NU215 means cylindrical-roller type NU, standard series 2, 75 mm bore — which is why the 130×25 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 5,600 r/min reference speed the 27.5 mm-section NU215 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 6,000 r/min as the mechanical ceiling. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.",
    "applications": [
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts",
      "large pump and turbine shafts",
      "rolling-mill work-roll backup bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Mount the 75 mm bore NU215 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU200 series at 75 mm bore (130×25 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 130 mm race release as noise within the first running hours.",
      "Open NU215 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The 150/156 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU215 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 215 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU215?",
        "a": "The NU 215 ECP is a single-row cylindrical roller bearing with 75 mm bore, 130 mm outer diameter and 25 mm width (2.953 × 5.118 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 150 kN, C0 156 kN, fatigue load limit Pu 20.4 kN, reference speed 5,600 r/min, limiting speed 6,000 r/min, mass about 1250 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU215 bore code work?",
        "a": "The last two digits of NU215 are bore code 15, so 15 × 5 = 75 mm bore. The 130 mm OD and 25 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU215?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU215 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU215 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU215-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6215",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6215-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6215-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N215-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 215 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ215-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 215 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP215-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 215 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU215 ECP",
      "NU215 ECP"
    ]
  },
  {
    "sku": "NU216",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 160,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 21.2,
    "max_rpm": 5600,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5600,
    "weight_g": 1550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 216 ECP",
    "naming_rule_text": "NU 216 ECP belongs to the SKF single-row cylindrical roller range — the 80 mm bore entry in the NU200 series, dimensioned 140 mm OD and 26 mm wide to the ISO 15 boundary plan. On the SKF nameplate, NU216 follows the ISO 15 convention: NU for the separable-inner-ring type, 2 for the standard, final digits 16 for the 80 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 5,300 r/min thermal reference and 5,600 r/min mechanical limiting speed. The outer ring has no ribs and cannot locate the shaft axially; pair NU216 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "large pump and turbine shafts",
      "rolling-mill work-roll backup bearings",
      "paper-machine dryer and calender rolls",
      "cement-kiln support-roller shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Mount the 80 mm bore NU216 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU200 series at 80 mm bore (140×26 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "The 160/166 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU216 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 216 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU216?",
        "a": "The NU 216 ECP is a single-row cylindrical roller bearing with 80 mm bore, 140 mm outer diameter and 26 mm width (3.15 × 5.512 × 1.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 160 kN, C0 166 kN, fatigue load limit Pu 21.2 kN, reference speed 5,300 r/min, limiting speed 5,600 r/min, mass about 1550 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU216 bore code work?",
        "a": "The last two digits of NU216 are bore code 16, so 16 × 5 = 80 mm bore. The 140 mm OD and 26 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU216?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU216 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU216 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU216-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6216",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6216-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6216-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N216-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 216 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ216-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 216 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP216-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 216 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU216 ECP",
      "NU216 ECP"
    ]
  },
  {
    "sku": "NU217",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 190,
    "static_load_kN": 200,
    "fatigue_load_limit_kN": 25,
    "max_rpm": 5300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5300,
    "weight_g": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 217 ECP",
    "naming_rule_text": "For a 85 mm shaft carrying pure radial load, SKF lists NU217 under catalogue execution NU 217 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 2 (the standard), and bore code 17 = 85 mm; dimensions 85×150×28 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 190 kN and C0 200 kN, the NU217 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 85 mm shaft typically takes a k5 seat with an H6 housing bore.",
    "applications": [
      "paper-machine dryer and calender rolls",
      "cement-kiln support-roller shafts",
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm bore NU217 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU200 series at 85 mm bore (150×28 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Open NU217 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The NU217 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The 190/200 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU217 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 217 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU217?",
        "a": "The NU 217 ECP is a single-row cylindrical roller bearing with 85 mm bore, 150 mm outer diameter and 28 mm width (3.346 × 5.906 × 1.102 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 190 kN, C0 200 kN, fatigue load limit Pu 25 kN, reference speed 4,800 r/min, limiting speed 5,300 r/min, mass about 1900 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU217 bore code work?",
        "a": "The last two digits of NU217 are bore code 17, so 17 × 5 = 85 mm bore. The 150 mm OD and 28 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU217?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU217 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU217 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU217-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6217",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6217-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6217-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N217-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 217 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ217-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 217 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP217-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 217 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU217 ECP",
      "NU217 ECP"
    ]
  },
  {
    "sku": "NU218",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 208,
    "static_load_kN": 220,
    "fatigue_load_limit_kN": 27,
    "max_rpm": 5000,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 5000,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 218 ECP",
    "naming_rule_text": "SKF NU218 (NU 218 ECP) is the standard cylindrical roller choice for a 90 mm shaft — one row of precisely profiled rollers on ground raceways inside the 160×30 mm ISO 15 envelope. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 2 is the ISO 15 diameter/width series (standard), and the last two digits encode the 90 mm bore; the 160 mm OD and 30 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 27 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.06 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. For a 90 mm shaft the usual inner-ring seat is k5 with an H6 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.",
    "applications": [
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts",
      "large pump and turbine shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 90 mm bore NU218 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU200 series at 90 mm bore (160×30 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 208/220 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU218 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 218 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU218?",
        "a": "The NU 218 ECP is a single-row cylindrical roller bearing with 90 mm bore, 160 mm outer diameter and 30 mm width (3.543 × 6.299 × 1.181 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 208 kN, C0 220 kN, fatigue load limit Pu 27 kN, reference speed 4,500 r/min, limiting speed 5,000 r/min, mass about 2300 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU218 bore code work?",
        "a": "The last two digits of NU218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 30 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU218?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU218 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU218 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU218-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6218",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6218-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6218-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N218-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 218 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ218-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 218 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP218-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 218 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU218 ECP",
      "NU218 ECP"
    ]
  },
  {
    "sku": "NU219",
    "brand": "SKF",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 255,
    "static_load_kN": 265,
    "fatigue_load_limit_kN": 32.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4800,
    "weight_g": 2850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 219 ECP",
    "naming_rule_text": "Ordering number NU 219 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 95 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. Digit by digit, NU219 reads as bearing type NU (single-row, inner ring separable), standard series 2, and bore reference 19 resolving to 95 mm; 170 mm OD and 32 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 1.04 (static 265 kN against dynamic 255 kN), typical of a cylindrical roller sized for high radial capacity, and the 32.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.",
    "applications": [
      "heavy industrial gearbox shafts",
      "large pump and turbine shafts",
      "rolling-mill work-roll backup bearings",
      "paper-machine dryer and calender rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Mount the 95 mm bore NU219 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU200 series at 95 mm bore (170×32 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The NU219 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The 2850 g mass and 32 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU219.",
      "The 255/265 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU219 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 219 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU219?",
        "a": "The NU 219 ECP is a single-row cylindrical roller bearing with 95 mm bore, 170 mm outer diameter and 32 mm width (3.74 × 6.693 × 1.26 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 255 kN, C0 265 kN, fatigue load limit Pu 32.5 kN, reference speed 4,300 r/min, limiting speed 4,800 r/min, mass about 2850 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU219 bore code work?",
        "a": "The last two digits of NU219 are bore code 19, so 19 × 5 = 95 mm bore. The 170 mm OD and 32 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU219?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU219 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU219 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU219-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6219",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6219-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6219-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N219-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 219 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ219-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 219 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP219-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 219 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU219 ECP",
      "NU219 ECP"
    ]
  },
  {
    "sku": "NU220",
    "brand": "SKF",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 285,
    "static_load_kN": 305,
    "fatigue_load_limit_kN": 36.5,
    "max_rpm": 4500,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4500,
    "weight_g": 3350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 220 ECP",
    "naming_rule_text": "NU220 is a single-row cylindrical roller bearing in the NU2200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 22 (the wide), and bore code 20 = 100 mm; dimensions 100×180×34 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 3350 g for the 100×180×34 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. The outer ring has no ribs and cannot locate the shaft axially; pair NU220 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "cement-kiln support-roller shafts",
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Mount the 100 mm bore NU220 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU2200 series at 100 mm bore (180×34 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "The NU220 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "Shaft and housing fillets must clear the bearing chamfer so the 34 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 285/305 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU220 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 220 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU220?",
        "a": "The NU 220 ECP is a single-row cylindrical roller bearing with 100 mm bore, 180 mm outer diameter and 34 mm width (3.937 × 7.087 × 1.339 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 285 kN, C0 305 kN, fatigue load limit Pu 36.5 kN, reference speed 4,000 r/min, limiting speed 4,500 r/min, mass about 3350 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU220 bore code work?",
        "a": "The last two digits of NU220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 34 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU220?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU220 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU220 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU220-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6220",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6220-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6220-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N220-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 220 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ220-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 220 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP220-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 220 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU220 ECP",
      "NU220 ECP"
    ]
  },
  {
    "sku": "NU304",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.5,
    "static_load_kN": 26,
    "fatigue_load_limit_kN": 3.25,
    "max_rpm": 18000,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 18000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 304 ECP",
    "naming_rule_text": "NU304 is a single-row cylindrical roller bearing in the NU300 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, NU304 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 04 for the 20 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 16.0 mm radial section height ((52−20)/2) and 140 g catalogue mass frame a 20 mm bore bearing rated at 35.5 kN C — roughly 1.77 kN of dynamic capacity per millimetre of bore before application factors. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.",
    "applications": [
      "pump and compressor crankshafts",
      "machine-tool spindle support (radial set)",
      "agricultural machinery power-take-off shafts",
      "automotive alternator and starter shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "At a 20 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU304 develops edge loading and early spalling.",
      "The NU300 series at 20 mm bore (52×15 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Catalogue reference speed and limiting speed are different limits: the 15,000 r/min reference is a thermal criterion under load, while the 18,000 r/min limiting value is the mechanical ceiling — observe both.",
      "Catalogue reference speed and limiting speed are different limits: the 15,000 r/min reference is a thermal criterion under load, while the 18,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 35.5/26 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU304 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 304 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU304?",
        "a": "The NU 304 ECP is a single-row cylindrical roller bearing with 20 mm bore, 52 mm outer diameter and 15 mm width (0.787 × 2.047 × 0.591 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 35.5 kN, C0 26 kN, fatigue load limit Pu 3.25 kN, reference speed 15,000 r/min, limiting speed 18,000 r/min, mass about 140 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU304 bore code work?",
        "a": "The last two digits of NU304 are bore code 04, so 04 × 5 = 20 mm bore. The 52 mm OD and 15 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU304?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU304 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU304 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6304",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6304-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6304-RSR",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6304-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N304-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 304 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ304-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 304 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP304-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 304 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU304 ECP",
      "NU304 ECP"
    ]
  },
  {
    "sku": "NU305",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 4.55,
    "max_rpm": 15000,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 15000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 305 ECP",
    "naming_rule_text": "The NU 305 ECP is a 25×62×17 mm single-row cylindrical roller bearing — the standard entry in the NU300 series, with separable inner ring and roller assembly for easy mounting. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 3 (the standard), and bore code 05 = 25 mm; dimensions 25×62×17 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 230 g for the 25×62×17 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. The outer ring has no ribs and cannot locate the shaft axially; pair NU305 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "agricultural machinery power-take-off shafts",
      "automotive alternator and starter shafts",
      "small conveyor drum bearings",
      "small electric-motor armature shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "At a 25 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU305 develops edge loading and early spalling.",
      "The NU300 series at 25 mm bore (62×17 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Open NU305 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "Open NU305 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The 46.5/36.5 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU305 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 305 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU305?",
        "a": "The NU 305 ECP is a single-row cylindrical roller bearing with 25 mm bore, 62 mm outer diameter and 17 mm width (0.984 × 2.441 × 0.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 46.5 kN, C0 36.5 kN, fatigue load limit Pu 4.55 kN, reference speed 12,000 r/min, limiting speed 15,000 r/min, mass about 230 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU305 bore code work?",
        "a": "The last two digits of NU305 are bore code 05, so 05 × 5 = 25 mm bore. The 62 mm OD and 17 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU305?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU305 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU305 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6305",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6305-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6305-RSR",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6305-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 305 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 305 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 305 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU305 ECP",
      "NU305 ECP"
    ]
  },
  {
    "sku": "NU306",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 48,
    "fatigue_load_limit_kN": 6.2,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 360,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 306 ECP",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU306 appears as NU 306 ECP: an open, single-row cylindrical roller bearing in the NU300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 3 is the ISO 15 diameter/width series (standard), and the last two digits encode the 30 mm bore; the 72 mm OD and 19 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 11,000 r/min reference speed the 21.0 mm-section NU306 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 12,000 r/min as the mechanical ceiling. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 30 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts",
      "pump and compressor drive shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "On this 30 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU300 series at 30 mm bore (72×19 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "The 58.5/48 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU306 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 306 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU306?",
        "a": "The NU 306 ECP is a single-row cylindrical roller bearing with 30 mm bore, 72 mm outer diameter and 19 mm width (1.181 × 2.835 × 0.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 58.5 kN, C0 48 kN, fatigue load limit Pu 6.2 kN, reference speed 11,000 r/min, limiting speed 12,000 r/min, mass about 360 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU306 bore code work?",
        "a": "The last two digits of NU306 are bore code 06, so 06 × 5 = 30 mm bore. The 72 mm OD and 19 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU306?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU306 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU306 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6306",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6306-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6306-RSR",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6306-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 306 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 306 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 306 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU306 ECP",
      "NU306 ECP"
    ]
  },
  {
    "sku": "NU307",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 75,
    "static_load_kN": 63,
    "fatigue_load_limit_kN": 8.15,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 307 ECP",
    "naming_rule_text": "NU 307 ECP belongs to the SKF single-row cylindrical roller range — the 35 mm bore entry in the NU300 series, dimensioned 80 mm OD and 21 mm wide to the ISO 15 boundary plan. Digit by digit, NU307 reads as bearing type NU (single-row, inner ring separable), standard series 3, and bore reference 07 resolving to 35 mm; 80 mm OD and 21 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 9,500 r/min thermal reference and 11,000 r/min mechanical limiting speed. For a 35 mm shaft the usual inner-ring seat is k5 with an H7 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.",
    "applications": [
      "pump and compressor drive shafts",
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 35 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU300 series at 35 mm bore (80×21 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The NU307 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The NU307 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The 75/63 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU307 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 307 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU307?",
        "a": "The NU 307 ECP is a single-row cylindrical roller bearing with 35 mm bore, 80 mm outer diameter and 21 mm width (1.378 × 3.15 × 0.827 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 75 kN, C0 63 kN, fatigue load limit Pu 8.15 kN, reference speed 9,500 r/min, limiting speed 11,000 r/min, mass about 470 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU307 bore code work?",
        "a": "The last two digits of NU307 are bore code 07, so 07 × 5 = 35 mm bore. The 80 mm OD and 21 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU307?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU307 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU307 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "6307",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6307-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6307-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 307 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 307 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 307 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU307 ECP",
      "NU307 ECP"
    ]
  },
  {
    "sku": "NU308",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 93,
    "static_load_kN": 78,
    "fatigue_load_limit_kN": 10.2,
    "max_rpm": 9500,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 9500,
    "weight_g": 650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 308 ECP",
    "naming_rule_text": "For a 40 mm shaft carrying pure radial load, SKF lists NU308 under catalogue execution NU 308 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Numbering ties the bearing to its envelope: NU308 means cylindrical-roller type NU, standard series 3, 40 mm bore — which is why the 90×23 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 93 kN and C0 78 kN, the NU308 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.",
    "applications": [
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "On this 40 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU300 series at 40 mm bore (90×23 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 93/78 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU308 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 308 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU308?",
        "a": "The NU 308 ECP is a single-row cylindrical roller bearing with 40 mm bore, 90 mm outer diameter and 23 mm width (1.575 × 3.543 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 93 kN, C0 78 kN, fatigue load limit Pu 10.2 kN, reference speed 8,000 r/min, limiting speed 9,500 r/min, mass about 650 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU308 bore code work?",
        "a": "The last two digits of NU308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU308?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU308 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU308 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU308-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6308",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6308-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6308-RSR",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6308-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 308 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 308 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 308 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU308 ECP",
      "NU308 ECP"
    ]
  },
  {
    "sku": "NU309",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 112,
    "static_load_kN": 100,
    "fatigue_load_limit_kN": 12.9,
    "max_rpm": 8500,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8500,
    "weight_g": 900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 309 ECP",
    "naming_rule_text": "SKF NU309 (NU 309 ECP) is the standard cylindrical roller choice for a 45 mm shaft — one row of precisely profiled rollers on ground raceways inside the 100×25 mm ISO 15 envelope. On the SKF nameplate, NU309 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 09 for the 45 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 12.9 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.89 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. Because the inner ring is separable, heat the inner ring (max 120 °C for the polymer cage) and mount it onto the shaft before inserting the outer ring; do not drive the rollers through the raceways during assembly.",
    "applications": [
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "On this 45 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU300 series at 45 mm bore (100×25 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The 900 g mass and 25 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU309.",
      "The 900 g mass and 25 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU309.",
      "The 112/100 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU309 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 309 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU309?",
        "a": "The NU 309 ECP is a single-row cylindrical roller bearing with 45 mm bore, 100 mm outer diameter and 25 mm width (1.772 × 3.937 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 112 kN, C0 100 kN, fatigue load limit Pu 12.9 kN, reference speed 7,500 r/min, limiting speed 8,500 r/min, mass about 900 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU309 bore code work?",
        "a": "The last two digits of NU309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 25 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU309?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU309 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU309 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6309",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6309-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6309-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 309 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 309 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 309 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU309 ECP",
      "NU309 ECP"
    ]
  },
  {
    "sku": "NU310",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 127,
    "static_load_kN": 112,
    "fatigue_load_limit_kN": 15,
    "max_rpm": 8000,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 8000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 310 ECP",
    "naming_rule_text": "Ordering number NU 310 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 50 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. Digit by digit, NU310 reads as bearing type NU (single-row, inner ring separable), standard series 3, and bore reference 10 resolving to 50 mm; 110 mm OD and 27 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 30.0 mm radial section height ((110−50)/2) and 1100 g catalogue mass frame a 50 mm bore bearing rated at 127 kN C — roughly 2.54 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 50 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "On this 50 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU300 series at 50 mm bore (110×27 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The 1100 g mass and 27 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU310.",
      "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 127/112 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU310 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 310 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU310?",
        "a": "The NU 310 ECP is a single-row cylindrical roller bearing with 50 mm bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 127 kN, C0 112 kN, fatigue load limit Pu 15 kN, reference speed 6,700 r/min, limiting speed 8,000 r/min, mass about 1100 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU310 bore code work?",
        "a": "The last two digits of NU310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 27 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU310?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU310 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU310 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU310-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6310",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6310-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6310-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 310 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 310 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 310 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU310 ECP",
      "NU310 ECP"
    ]
  },
  {
    "sku": "NU311",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 156,
    "static_load_kN": 143,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 7000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 7000,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 311 ECP",
    "naming_rule_text": "NU311 is a single-row cylindrical roller bearing in the NU300 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: NU311 means cylindrical-roller type NU, standard series 3, 55 mm bore — which is why the 120×29 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 1450 g for the 55×120×29 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. For a 55 mm shaft the usual inner-ring seat is k5 with an H6 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.",
    "applications": [
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "On this 55 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU300 series at 55 mm bore (120×29 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 120 mm race release as noise within the first running hours.",
      "The 1450 g mass and 29 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU311.",
      "The 156/143 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU311 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 311 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU311?",
        "a": "The NU 311 ECP is a single-row cylindrical roller bearing with 55 mm bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 156 kN, C0 143 kN, fatigue load limit Pu 18.6 kN, reference speed 6,000 r/min, limiting speed 7,000 r/min, mass about 1450 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU311 bore code work?",
        "a": "The last two digits of NU311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 29 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU311?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU311 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU311 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6311",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6311-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6311-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 311 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 311 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 311 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU311 ECP",
      "NU311 ECP"
    ]
  },
  {
    "sku": "NU312",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 173,
    "static_load_kN": 160,
    "fatigue_load_limit_kN": 21.2,
    "max_rpm": 6700,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6700,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 312 ECP",
    "naming_rule_text": "The NU 312 ECP is a 60×130×31 mm single-row cylindrical roller bearing — the standard entry in the NU300 series, with separable inner ring and roller assembly for easy mounting. On the SKF nameplate, NU312 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 12 for the 60 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 5,600 r/min reference speed the 35.0 mm-section NU312 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 6,700 r/min as the mechanical ceiling. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.",
    "applications": [
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts",
      "large pump and turbine shafts",
      "rolling-mill work-roll backup bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 60 mm bore NU312 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU300 series at 60 mm bore (130×31 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Catalogue reference speed and limiting speed are different limits: the 5,600 r/min reference is a thermal criterion under load, while the 6,700 r/min limiting value is the mechanical ceiling — observe both.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 130 mm race release as noise within the first running hours.",
      "The 173/160 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU312 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 312 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU312?",
        "a": "The NU 312 ECP is a single-row cylindrical roller bearing with 60 mm bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 173 kN, C0 160 kN, fatigue load limit Pu 21.2 kN, reference speed 5,600 r/min, limiting speed 6,700 r/min, mass about 1750 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU312 bore code work?",
        "a": "The last two digits of NU312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 31 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU312?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU312 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU312 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6312",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6312-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6312-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 312 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 312 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 312 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU312 ECP",
      "NU312 ECP"
    ]
  },
  {
    "sku": "NU313",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 212,
    "static_load_kN": 196,
    "fatigue_load_limit_kN": 25.5,
    "max_rpm": 6000,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 6000,
    "weight_g": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 313 ECP",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU313 appears as NU 313 ECP: an open, single-row cylindrical roller bearing in the NU300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 3 (the standard), and bore code 13 = 65 mm; dimensions 65×140×33 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 5,300 r/min thermal reference and 6,000 r/min mechanical limiting speed. Because the inner ring is separable, heat the inner ring (max 120 °C for the polymer cage) and mount it onto the shaft before inserting the outer ring; do not drive the rollers through the raceways during assembly.",
    "applications": [
      "large pump and turbine shafts",
      "rolling-mill work-roll backup bearings",
      "paper-machine dryer and calender rolls",
      "cement-kiln support-roller shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 65 mm bore NU313 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU300 series at 65 mm bore (140×33 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Open NU313 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 6,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 212/196 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU313 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 313 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU313?",
        "a": "The NU 313 ECP is a single-row cylindrical roller bearing with 65 mm bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 212 kN, C0 196 kN, fatigue load limit Pu 25.5 kN, reference speed 5,300 r/min, limiting speed 6,000 r/min, mass about 2200 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU313 bore code work?",
        "a": "The last two digits of NU313 are bore code 13, so 13 × 5 = 65 mm bore. The 140 mm OD and 33 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU313?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU313 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU313 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6313",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6313-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6313-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N313-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 313 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ313-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 313 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP313-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 313 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU313 ECP",
      "NU313 ECP"
    ]
  },
  {
    "sku": "NU314",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 236,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 29,
    "max_rpm": 5600,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5600,
    "weight_g": 2700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 314 ECP",
    "naming_rule_text": "NU 314 ECP belongs to the SKF single-row cylindrical roller range — the 70 mm bore entry in the NU300 series, dimensioned 150 mm OD and 35 mm wide to the ISO 15 boundary plan. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 3 is the ISO 15 diameter/width series (standard), and the last two digits encode the 70 mm bore; the 150 mm OD and 35 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 236 kN and C0 228 kN, the NU314 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Mount the separable inner ring + roller assembly onto the shaft first, then slide the outer ring into the housing; the NU design has no outer-ring ribs, so axial location of the shaft must be provided by adjacent components or a second bearing.",
    "applications": [
      "paper-machine dryer and calender rolls",
      "cement-kiln support-roller shafts",
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Mount the 70 mm bore NU314 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU300 series at 70 mm bore (150×35 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "Open NU314 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The 236/228 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU314 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 314 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU314?",
        "a": "The NU 314 ECP is a single-row cylindrical roller bearing with 70 mm bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 236 kN, C0 228 kN, fatigue load limit Pu 29 kN, reference speed 4,800 r/min, limiting speed 5,600 r/min, mass about 2700 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU314 bore code work?",
        "a": "The last two digits of NU314 are bore code 14, so 14 × 5 = 70 mm bore. The 150 mm OD and 35 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU314?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU314 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU314 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6314",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6314-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6314-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N314-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 314 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ314-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 314 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP314-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 314 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU314 ECP",
      "NU314 ECP"
    ]
  },
  {
    "sku": "NU315",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 280,
    "static_load_kN": 265,
    "fatigue_load_limit_kN": 33.5,
    "max_rpm": 5300,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 5300,
    "weight_g": 3300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 315 ECP",
    "naming_rule_text": "For a 75 mm shaft carrying pure radial load, SKF lists NU315 under catalogue execution NU 315 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Digit by digit, NU315 reads as bearing type NU (single-row, inner ring separable), standard series 3, and bore reference 15 resolving to 75 mm; 160 mm OD and 37 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 33.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.95 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.",
    "applications": [
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts",
      "large pump and turbine shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Mount the 75 mm bore NU315 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU300 series at 75 mm bore (160×37 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The NU315 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "The 280/265 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU315 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 315 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU315?",
        "a": "The NU 315 ECP is a single-row cylindrical roller bearing with 75 mm bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 280 kN, C0 265 kN, fatigue load limit Pu 33.5 kN, reference speed 4,500 r/min, limiting speed 5,300 r/min, mass about 3300 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU315 bore code work?",
        "a": "The last two digits of NU315 are bore code 15, so 15 × 5 = 75 mm bore. The 160 mm OD and 37 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU315?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU315 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU315 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6315",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6315-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6315-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N315-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 315 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ315-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 315 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP315-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 315 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU315 ECP",
      "NU315 ECP"
    ]
  },
  {
    "sku": "NU316",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 300,
    "static_load_kN": 290,
    "fatigue_load_limit_kN": 36,
    "max_rpm": 5000,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5000,
    "weight_g": 3850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 316 ECP",
    "naming_rule_text": "SKF NU316 (NU 316 ECP) is the standard cylindrical roller choice for a 80 mm shaft — one row of precisely profiled rollers on ground raceways inside the 170×39 mm ISO 15 envelope. Numbering ties the bearing to its envelope: NU316 means cylindrical-roller type NU, standard series 3, 80 mm bore — which is why the 170×39 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 0.97 (static 290 kN against dynamic 300 kN), typical of a cylindrical roller sized for high radial capacity, and the 36 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The outer ring has no ribs and cannot locate the shaft axially; pair NU316 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "heavy industrial gearbox shafts",
      "large pump and turbine shafts",
      "rolling-mill work-roll backup bearings",
      "paper-machine dryer and calender rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Mount the 80 mm bore NU316 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU300 series at 80 mm bore (170×39 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Shaft and housing fillets must clear the bearing chamfer so the 39 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The NU316 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The 300/290 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU316 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 316 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU316?",
        "a": "The NU 316 ECP is a single-row cylindrical roller bearing with 80 mm bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 300 kN, C0 290 kN, fatigue load limit Pu 36 kN, reference speed 4,300 r/min, limiting speed 5,000 r/min, mass about 3850 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU316 bore code work?",
        "a": "The last two digits of NU316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 39 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU316?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU316 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU316 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6316",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6316-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6316-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N316-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 316 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ316-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 316 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP316-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 316 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU316 ECP",
      "NU316 ECP"
    ]
  },
  {
    "sku": "NU317",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 340,
    "static_load_kN": 335,
    "fatigue_load_limit_kN": 41.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4800,
    "weight_g": 4650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 317 ECP",
    "naming_rule_text": "Ordering number NU 317 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 85 mm shaft, standard section, with an open polymer-cage execution and separable inner ring assembly. On the SKF nameplate, NU317 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 17 for the 85 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 47.5 mm radial section height ((180−85)/2) and 4650 g catalogue mass frame a 85 mm bore bearing rated at 340 kN C — roughly 4.00 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 85 mm shaft typically takes a k5 seat with an H6 housing bore.",
    "applications": [
      "rolling-mill work-roll backup bearings",
      "paper-machine dryer and calender rolls",
      "cement-kiln support-roller shafts",
      "wind-turbine gearbox intermediate shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 85 mm bore NU317 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU300 series at 85 mm bore (180×41 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "The 4650 g mass and 41 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU317.",
      "Shaft and housing fillets must clear the bearing chamfer so the 41 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 340/335 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU317 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 317 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU317?",
        "a": "The NU 317 ECP is a single-row cylindrical roller bearing with 85 mm bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 340 kN, C0 335 kN, fatigue load limit Pu 41.5 kN, reference speed 4,000 r/min, limiting speed 4,800 r/min, mass about 4650 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU317 bore code work?",
        "a": "The last two digits of NU317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 41 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU317?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU317 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU317 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6317",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6317-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6317-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N317-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 317 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ317-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 317 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP317-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 317 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU317 ECP",
      "NU317 ECP"
    ]
  },
  {
    "sku": "NU318",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 365,
    "static_load_kN": 360,
    "fatigue_load_limit_kN": 43,
    "max_rpm": 4500,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4500,
    "weight_g": 5250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 318 ECP",
    "naming_rule_text": "NU318 is a single-row cylindrical roller bearing in the NU300 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 3 (the standard), and bore code 18 = 90 mm; dimensions 90×190×43 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 5250 g for the 90×190×43 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. For a 90 mm shaft the usual inner-ring seat is k5 with an H6 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.",
    "applications": [
      "cement-kiln support-roller shafts",
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Mount the 90 mm bore NU318 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU300 series at 90 mm bore (190×43 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 190 mm race release as noise within the first running hours.",
      "The 5250 g mass and 43 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU318.",
      "The 365/360 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU318 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 318 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU318?",
        "a": "The NU 318 ECP is a single-row cylindrical roller bearing with 90 mm bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 365 kN, C0 360 kN, fatigue load limit Pu 43 kN, reference speed 3,800 r/min, limiting speed 4,500 r/min, mass about 5250 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU318 bore code work?",
        "a": "The last two digits of NU318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 43 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU318?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU318 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU318 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6318",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6318-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6318-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N318-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 318 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ318-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 318 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP318-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 318 ECJ is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU318 ECP",
      "NU318 ECP"
    ]
  },
  {
    "sku": "NU319",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 390,
    "static_load_kN": 390,
    "fatigue_load_limit_kN": 46.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4300,
    "weight_g": 6200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 319 ECP",
    "naming_rule_text": "The NU 319 ECP is a 95×200×45 mm single-row cylindrical roller bearing — the standard entry in the NU300 series, with separable inner ring and roller assembly for easy mounting. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 3 is the ISO 15 diameter/width series (standard), and the last two digits encode the 95 mm bore; the 200 mm OD and 45 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 3,600 r/min reference speed the 52.5 mm-section NU319 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 4,300 r/min as the mechanical ceiling. Check raceway alignment after mounting: single-row cylindrical roller bearings tolerate only ≈ 3–4 minutes of arc misalignment; beyond that edge loading accelerates fatigue.",
    "applications": [
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts",
      "large pump and turbine shafts",
      "rolling-mill work-roll backup bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Mount the 95 mm bore NU319 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU300 series at 95 mm bore (200×45 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Catalogue reference speed and limiting speed are different limits: the 3,600 r/min reference is a thermal criterion under load, while the 4,300 r/min limiting value is the mechanical ceiling — observe both.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 200 mm race release as noise within the first running hours.",
      "The 390/390 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU319 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 319 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU319?",
        "a": "The NU 319 ECP is a single-row cylindrical roller bearing with 95 mm bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 390 kN, C0 390 kN, fatigue load limit Pu 46.5 kN, reference speed 3,600 r/min, limiting speed 4,300 r/min, mass about 6200 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU319 bore code work?",
        "a": "The last two digits of NU319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 45 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU319?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU319 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU319 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6319",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6319-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6319-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N319-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 319 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ319-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 319 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP319-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 319 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU319 ECP",
      "NU319 ECP"
    ]
  },
  {
    "sku": "NU320",
    "brand": "SKF",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 450,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 51,
    "max_rpm": 3800,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 3800,
    "weight_g": 7450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 320 ECP",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU320 appears as NU 320 ECP: an open, single-row cylindrical roller bearing in the NU300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. On the SKF nameplate, NU320 follows the ISO 15 convention: NU for the separable-inner-ring type, 3 for the standard, final digits 20 for the 100 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 450 kN and C0 440 kN, the NU320 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. The outer ring has no ribs and cannot locate the shaft axially; pair NU320 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "paper-machine dryer and calender rolls",
      "cement-kiln support-roller shafts",
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Mount the 100 mm bore NU320 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU300 series at 100 mm bore (215×47 mm) is the standard-section cylindrical roller envelope; stepping to a wide-section 22/23 variant changes OD, width and heat generation — it is not a drop-in swap when the housing and speed are fixed.",
      "Catalogue reference speed and limiting speed are different limits: the 3,200 r/min reference is a thermal criterion under load, while the 3,800 r/min limiting value is the mechanical ceiling — observe both.",
      "The 7450 g mass and 47 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU320.",
      "The 450/440 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU320 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 320 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU320?",
        "a": "The NU 320 ECP is a single-row cylindrical roller bearing with 100 mm bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 450 kN, C0 440 kN, fatigue load limit Pu 51 kN, reference speed 3,200 r/min, limiting speed 3,800 r/min, mass about 7450 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU320 bore code work?",
        "a": "The last two digits of NU320 are bore code 20, so 20 × 5 = 100 mm bore. The 215 mm OD and 47 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU320?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU320 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU320 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU320-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "6320-2RS",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "6320-ZZ",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Identical envelope but a different bearing type — confirm load and speed suitability before substitution."
      },
      {
        "equiv_sku": "N320-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF N 320 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NJ320-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 320 ECJ is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP320-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 320 ECJ is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU320 ECP",
      "NU320 ECP"
    ]
  },
  {
    "sku": "NU2205",
    "brand": "SKF",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 34,
    "fatigue_load_limit_kN": 4.25,
    "max_rpm": 16000,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 16000,
    "weight_g": 160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2205 ECP",
    "naming_rule_text": "NU2205 is a single-row cylindrical roller bearing in the NU2200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, NU2205 reads as bearing type NU (single-row, inner ring separable), wide series 22, and bore reference 05 resolving to 25 mm; 52 mm OD and 18 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 39 kN and C0 34 kN, the NU2205 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. Mount the separable inner ring + roller assembly onto the shaft first, then slide the outer ring into the housing; the NU design has no outer-ring ribs, so axial location of the shaft must be provided by adjacent components or a second bearing.",
    "applications": [
      "machine-tool spindle support (radial set)",
      "agricultural machinery power-take-off shafts",
      "automotive alternator and starter shafts",
      "small conveyor drum bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "At a 25 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU2205 develops edge loading and early spalling.",
      "The NU2200 series at 25 mm bore (52×18 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "Open NU2205 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The NU2205 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The 39/34 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2205 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2205 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2205?",
        "a": "The NU 2205 ECP is a single-row cylindrical roller bearing with 25 mm bore, 52 mm outer diameter and 18 mm width (0.984 × 2.047 × 0.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 39 kN, C0 34 kN, fatigue load limit Pu 4.25 kN, reference speed 15,000 r/min, limiting speed 16,000 r/min, mass about 160 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2205 bore code work?",
        "a": "The last two digits of NU2205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 18 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2205?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2205 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2205 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2205 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2205 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2205 ECP",
      "NU2205 ECP"
    ]
  },
  {
    "sku": "NU2206",
    "brand": "SKF",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 55,
    "static_load_kN": 49,
    "fatigue_load_limit_kN": 6.1,
    "max_rpm": 14000,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 14000,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2206 ECP",
    "naming_rule_text": "The NU 2206 ECP is a 30×62×20 mm single-row cylindrical roller bearing — the wide entry in the NU2200 series, with separable inner ring and roller assembly for easy mounting. Numbering ties the bearing to its envelope: NU2206 means cylindrical-roller type NU, wide series 22, 30 mm bore — which is why the 62×20 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 6.1 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 0.89 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.",
    "applications": [
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts",
      "pump and compressor drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 30 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2200 series at 30 mm bore (62×20 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 55/49 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2206 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2206 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2206?",
        "a": "The NU 2206 ECP is a single-row cylindrical roller bearing with 30 mm bore, 62 mm outer diameter and 20 mm width (1.181 × 2.441 × 0.787 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 55 kN, C0 49 kN, fatigue load limit Pu 6.1 kN, reference speed 13,000 r/min, limiting speed 14,000 r/min, mass about 260 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2206 bore code work?",
        "a": "The last two digits of NU2206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 20 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2206?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2206 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2206 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2206 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2206 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2206 ECP",
      "NU2206 ECP"
    ]
  },
  {
    "sku": "NU2207",
    "brand": "SKF",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 63,
    "fatigue_load_limit_kN": 8.15,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2207 ECP",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU2207 appears as NU 2207 ECP: an open, single-row cylindrical roller bearing in the NU2200 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. On the SKF nameplate, NU2207 follows the ISO 15 convention: NU for the separable-inner-ring type, 22 for the wide, final digits 07 for the 35 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 0.91 (static 63 kN against dynamic 69.5 kN), typical of a cylindrical roller sized for high radial capacity, and the 8.15 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The outer ring has no ribs and cannot locate the shaft axially; pair NU2207 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "industrial gearbox input/output shafts",
      "pump and compressor drive shafts",
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "On this 35 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2200 series at 35 mm bore (72×23 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "The NU2207 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "The 400 g mass and 23 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2207.",
      "The 69.5/63 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2207 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2207 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2207?",
        "a": "The NU 2207 ECP is a single-row cylindrical roller bearing with 35 mm bore, 72 mm outer diameter and 23 mm width (1.378 × 2.835 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 69.5 kN, C0 63 kN, fatigue load limit Pu 8.15 kN, reference speed 11,000 r/min, limiting speed 12,000 r/min, mass about 400 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2207 bore code work?",
        "a": "The last two digits of NU2207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2207?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2207 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2207 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2207 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2207 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2207 ECP",
      "NU2207 ECP"
    ]
  },
  {
    "sku": "NU2208",
    "brand": "SKF",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 81.5,
    "static_load_kN": 75,
    "fatigue_load_limit_kN": 9.65,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2208 ECP",
    "naming_rule_text": "NU 2208 ECP belongs to the SKF single-row cylindrical roller range — the 40 mm bore entry in the NU2200 series, dimensioned 80 mm OD and 23 mm wide to the ISO 15 boundary plan. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 22 (the wide), and bore code 08 = 40 mm; dimensions 40×80×23 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 20.0 mm radial section height ((80−40)/2) and 490 g catalogue mass frame a 40 mm bore bearing rated at 81.5 kN C — roughly 2.04 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 40 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "On this 40 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2200 series at 40 mm bore (80×23 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "Shaft and housing fillets must clear the bearing chamfer so the 23 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 80 mm race release as noise within the first running hours.",
      "The 81.5/75 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2208 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2208 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2208?",
        "a": "The NU 2208 ECP is a single-row cylindrical roller bearing with 40 mm bore, 80 mm outer diameter and 23 mm width (1.575 × 3.15 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 81.5 kN, C0 75 kN, fatigue load limit Pu 9.65 kN, reference speed 9,500 r/min, limiting speed 11,000 r/min, mass about 490 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2208 bore code work?",
        "a": "The last two digits of NU2208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2208?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2208 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2208 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2208-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2208 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2208 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2208 ECP",
      "NU2208 ECP"
    ]
  },
  {
    "sku": "NU2209",
    "brand": "SKF",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 85,
    "static_load_kN": 81.5,
    "fatigue_load_limit_kN": 10.6,
    "max_rpm": 9500,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 9500,
    "weight_g": 520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2209 ECP",
    "naming_rule_text": "For a 45 mm shaft carrying pure radial load, SKF lists NU2209 under catalogue execution NU 2209 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 22 is the ISO 15 diameter/width series (wide), and the last two digits encode the 45 mm bore; the 85 mm OD and 23 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 520 g for the 45×85×23 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. For a 45 mm shaft the usual inner-ring seat is k5 with an H7 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.",
    "applications": [
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "On this 45 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2200 series at 45 mm bore (85×23 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "The 520 g mass and 23 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2209.",
      "Catalogue reference speed and limiting speed are different limits: the 9,000 r/min reference is a thermal criterion under load, while the 9,500 r/min limiting value is the mechanical ceiling — observe both.",
      "The 85/81.5 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2209 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2209 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2209?",
        "a": "The NU 2209 ECP is a single-row cylindrical roller bearing with 45 mm bore, 85 mm outer diameter and 23 mm width (1.772 × 3.346 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 85 kN, C0 81.5 kN, fatigue load limit Pu 10.6 kN, reference speed 9,000 r/min, limiting speed 9,500 r/min, mass about 520 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2209 bore code work?",
        "a": "The last two digits of NU2209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2209?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2209 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2209 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2209-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2209 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2209 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2209 ECP",
      "NU2209 ECP"
    ]
  },
  {
    "sku": "NU2210",
    "brand": "SKF",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 90,
    "static_load_kN": 88,
    "fatigue_load_limit_kN": 11.4,
    "max_rpm": 9000,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 9000,
    "weight_g": 560,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2210 ECP",
    "naming_rule_text": "SKF NU2210 (NU 2210 ECP) is the wide cylindrical roller choice for a 50 mm shaft — one row of precisely profiled rollers on ground raceways inside the 90×23 mm ISO 15 envelope. On the SKF nameplate, NU2210 follows the ISO 15 convention: NU for the separable-inner-ring type, 22 for the wide, final digits 10 for the 50 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 8,500 r/min thermal reference and 9,000 r/min mechanical limiting speed. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.",
    "applications": [
      "pump and compressor drive shafts",
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "On this 50 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2200 series at 50 mm bore (90×23 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "The 560 g mass and 23 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2210.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 90 mm race release as noise within the first running hours.",
      "The 90/88 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2210 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2210 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2210?",
        "a": "The NU 2210 ECP is a single-row cylindrical roller bearing with 50 mm bore, 90 mm outer diameter and 23 mm width (1.969 × 3.543 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 90 kN, C0 88 kN, fatigue load limit Pu 11.4 kN, reference speed 8,500 r/min, limiting speed 9,000 r/min, mass about 560 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2210 bore code work?",
        "a": "The last two digits of NU2210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 23 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2210?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2210 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2210 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2210-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2210 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2210 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2210 ECP",
      "NU2210 ECP"
    ]
  },
  {
    "sku": "NU2211",
    "brand": "SKF",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 114,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 15.3,
    "max_rpm": 8000,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8000,
    "weight_g": 790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2211 ECP",
    "naming_rule_text": "Ordering number NU 2211 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 55 mm shaft, wide section, with an open polymer-cage execution and separable inner ring assembly. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 22 (the wide), and bore code 11 = 55 mm; dimensions 55×100×25 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 114 kN and C0 118 kN, the NU2211 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. The outer ring has no ribs and cannot locate the shaft axially; pair NU2211 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 55 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2200 series at 55 mm bore (100×25 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 100 mm race release as noise within the first running hours.",
      "Catalogue reference speed and limiting speed are different limits: the 7,500 r/min reference is a thermal criterion under load, while the 8,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 114/118 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2211 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2211 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2211?",
        "a": "The NU 2211 ECP is a single-row cylindrical roller bearing with 55 mm bore, 100 mm outer diameter and 25 mm width (2.165 × 3.937 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 114 kN, C0 118 kN, fatigue load limit Pu 15.3 kN, reference speed 7,500 r/min, limiting speed 8,000 r/min, mass about 790 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2211 bore code work?",
        "a": "The last two digits of NU2211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 25 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2211?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2211 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2211 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2211-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2211 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2211 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2211 ECP",
      "NU2211 ECP"
    ]
  },
  {
    "sku": "NU2212",
    "brand": "SKF",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 146,
    "static_load_kN": 153,
    "fatigue_load_limit_kN": 20,
    "max_rpm": 7500,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 7500,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2212 ECP",
    "naming_rule_text": "NU2212 is a single-row cylindrical roller bearing in the NU2200 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 22 is the ISO 15 diameter/width series (wide), and the last two digits encode the 60 mm bore; the 110 mm OD and 28 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 20 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.05 C0/C balance shows this execution is tuned to heavy radial loads rather than mixed radial-plus-axial duty. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 60 mm shaft typically takes a k5 seat with an H6 housing bore.",
    "applications": [
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts",
      "large pump and turbine shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Mount the 60 mm bore NU2212 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU2200 series at 60 mm bore (110×28 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU200 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "Catalogue reference speed and limiting speed are different limits: the 6,700 r/min reference is a thermal criterion under load, while the 7,500 r/min limiting value is the mechanical ceiling — observe both.",
      "Open NU2212 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The 146/153 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2212 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2212 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2212?",
        "a": "The NU 2212 ECP is a single-row cylindrical roller bearing with 60 mm bore, 110 mm outer diameter and 28 mm width (2.362 × 4.331 × 1.102 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 146 kN, C0 153 kN, fatigue load limit Pu 20 kN, reference speed 6,700 r/min, limiting speed 7,500 r/min, mass about 1050 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2212 bore code work?",
        "a": "The last two digits of NU2212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 28 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2212?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2212 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2212 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2212-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2212 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2212 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2212 ECP",
      "NU2212 ECP"
    ]
  },
  {
    "sku": "NU2305",
    "brand": "SKF",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 64,
    "static_load_kN": 55,
    "fatigue_load_limit_kN": 6.95,
    "max_rpm": 15000,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 15000,
    "weight_g": 340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2305 ECP",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU2305 appears as NU 2305 ECP: an open, single-row cylindrical roller bearing in the NU2300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 23 is the ISO 15 diameter/width series (wide), and the last two digits encode the 25 mm bore; the 62 mm OD and 24 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 18.5 mm radial section height ((62−25)/2) and 340 g catalogue mass frame a 25 mm bore bearing rated at 64 kN C — roughly 2.56 kN of dynamic capacity per millimetre of bore before application factors. Mount the separable inner ring + roller assembly onto the shaft first, then slide the outer ring into the housing; the NU design has no outer-ring ribs, so axial location of the shaft must be provided by adjacent components or a second bearing.",
    "applications": [
      "pump and compressor crankshafts",
      "machine-tool spindle support (radial set)",
      "agricultural machinery power-take-off shafts",
      "automotive alternator and starter shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At a 25 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU2305 develops edge loading and early spalling.",
      "The NU2300 series at 25 mm bore (62×24 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "The 340 g mass and 24 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2305.",
      "Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The 64/55 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2305 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2305 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2305?",
        "a": "The NU 2305 ECP is a single-row cylindrical roller bearing with 25 mm bore, 62 mm outer diameter and 24 mm width (0.984 × 2.441 × 0.945 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 64 kN, C0 55 kN, fatigue load limit Pu 6.95 kN, reference speed 12,000 r/min, limiting speed 15,000 r/min, mass about 340 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2305 bore code work?",
        "a": "The last two digits of NU2305 are bore code 05, so 05 × 5 = 25 mm bore. The 62 mm OD and 24 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2305?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2305 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2305 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2305 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2305 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2305 ECP",
      "NU2305 ECP"
    ]
  },
  {
    "sku": "NU2306",
    "brand": "SKF",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 83,
    "static_load_kN": 75,
    "fatigue_load_limit_kN": 9.65,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2306 ECP",
    "naming_rule_text": "NU 2306 ECP belongs to the SKF single-row cylindrical roller range — the 30 mm bore entry in the NU2300 series, dimensioned 72 mm OD and 27 mm wide to the ISO 15 boundary plan. Digit by digit, NU2306 reads as bearing type NU (single-row, inner ring separable), wide series 23, and bore reference 06 resolving to 30 mm; 72 mm OD and 27 mm width are the matching ISO 15 boundary values. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 530 g for the 30×72×27 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.",
    "applications": [
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "On this 30 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2300 series at 30 mm bore (72×27 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 72 mm race release as noise within the first running hours.",
      "The 530 g mass and 27 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2306.",
      "The 83/75 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2306 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2306 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2306?",
        "a": "The NU 2306 ECP is a single-row cylindrical roller bearing with 30 mm bore, 72 mm outer diameter and 27 mm width (1.181 × 2.835 × 1.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 83 kN, C0 75 kN, fatigue load limit Pu 9.65 kN, reference speed 11,000 r/min, limiting speed 12,000 r/min, mass about 530 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2306 bore code work?",
        "a": "The last two digits of NU2306 are bore code 06, so 06 × 5 = 30 mm bore. The 72 mm OD and 27 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2306?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2306 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2306 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2306 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2306 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2306 ECP",
      "NU2306 ECP"
    ]
  },
  {
    "sku": "NU2307",
    "brand": "SKF",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 106,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 12.7,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2307 ECP",
    "naming_rule_text": "For a 35 mm shaft carrying pure radial load, SKF lists NU2307 under catalogue execution NU 2307 ECP: one open single-row cylindrical roller bearing with polymer cage and separable inner ring. Numbering ties the bearing to its envelope: NU2307 means cylindrical-roller type NU, wide series 23, 35 mm bore — which is why the 80×31 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. At 9,500 r/min reference speed the 22.5 mm-section NU2307 is governed thermally by cage material and lubricant flow; oil or grease selection should be made against that value, with 11,000 r/min as the mechanical ceiling. The outer ring has no ribs and cannot locate the shaft axially; pair NU2307 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "crane hoist and trolley wheel shafts",
      "industrial gearbox input/output shafts",
      "pump and compressor drive shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "On this 35 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2300 series at 35 mm bore (80×31 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "Catalogue reference speed and limiting speed are different limits: the 9,500 r/min reference is a thermal criterion under load, while the 11,000 r/min limiting value is the mechanical ceiling — observe both.",
      "Never press the outer ring through the roller complement during fitting: force for a press fit goes through the ring faces only, or brinell marks on the 80 mm race release as noise within the first running hours.",
      "The 106/98 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2307 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2307 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2307?",
        "a": "The NU 2307 ECP is a single-row cylindrical roller bearing with 35 mm bore, 80 mm outer diameter and 31 mm width (1.378 × 3.15 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 106 kN, C0 98 kN, fatigue load limit Pu 12.7 kN, reference speed 9,500 r/min, limiting speed 11,000 r/min, mass about 720 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2307 bore code work?",
        "a": "The last two digits of NU2307 are bore code 07, so 07 × 5 = 35 mm bore. The 80 mm OD and 31 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2307?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2307 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2307 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2307 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2307 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2307 ECP",
      "NU2307 ECP"
    ]
  },
  {
    "sku": "NU2308",
    "brand": "SKF",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 129,
    "static_load_kN": 120,
    "fatigue_load_limit_kN": 15.3,
    "max_rpm": 9500,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 9500,
    "weight_g": 930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2308 ECP",
    "naming_rule_text": "SKF NU2308 (NU 2308 ECP) is the wide cylindrical roller choice for a 40 mm shaft — one row of precisely profiled rollers on ground raceways inside the 90×33 mm ISO 15 envelope. On the SKF nameplate, NU2308 follows the ISO 15 convention: NU for the separable-inner-ring type, 23 for the wide, final digits 08 for the 40 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Speed planning uses two different ceilings: 8,000 r/min thermal reference and 9,500 r/min mechanical limiting speed. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 40 mm shaft typically takes a k5 seat with an H7 housing bore.",
    "applications": [
      "pump and compressor drive shafts",
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "On this 40 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2300 series at 40 mm bore (90×33 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "Open NU2308 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "Catalogue reference speed and limiting speed are different limits: the 8,000 r/min reference is a thermal criterion under load, while the 9,500 r/min limiting value is the mechanical ceiling — observe both.",
      "The 129/120 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2308 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2308 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2308?",
        "a": "The NU 2308 ECP is a single-row cylindrical roller bearing with 40 mm bore, 90 mm outer diameter and 33 mm width (1.575 × 3.543 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 129 kN, C0 120 kN, fatigue load limit Pu 15.3 kN, reference speed 8,000 r/min, limiting speed 9,500 r/min, mass about 930 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2308 bore code work?",
        "a": "The last two digits of NU2308 are bore code 08, so 08 × 5 = 40 mm bore. The 90 mm OD and 33 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2308?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2308 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2308 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2308-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2308 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2308 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2308 ECP",
      "NU2308 ECP"
    ]
  },
  {
    "sku": "NU2309",
    "brand": "SKF",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 160,
    "static_load_kN": 153,
    "fatigue_load_limit_kN": 20,
    "max_rpm": 8500,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8500,
    "weight_g": 1300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2309 ECP",
    "naming_rule_text": "Ordering number NU 2309 ECP in SKF catalogue PUB BU/P1 17000 denotes a single-row cylindrical roller bearing for a 45 mm shaft, wide section, with an open polymer-cage execution and separable inner ring assembly. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 23 (the wide), and bore code 09 = 45 mm; dimensions 45×100×36 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. With C 160 kN and C0 153 kN, the NU2309 radial-capacity check is straightforward: keep the equivalent load P below the rating at the required L10; axial load is not supported by the NU design. For a 45 mm shaft the usual inner-ring seat is k5 with an H7 housing when the inner ring rotates; the outer ring slides axially to accommodate thermal expansion of the shaft.",
    "applications": [
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains",
      "crane hoist and trolley wheel shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 45 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2300 series at 45 mm bore (100×36 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "Open NU2309 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The 160/153 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2309 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2309 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2309?",
        "a": "The NU 2309 ECP is a single-row cylindrical roller bearing with 45 mm bore, 100 mm outer diameter and 36 mm width (1.772 × 3.937 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 160 kN, C0 153 kN, fatigue load limit Pu 20 kN, reference speed 7,500 r/min, limiting speed 8,500 r/min, mass about 1300 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2309 bore code work?",
        "a": "The last two digits of NU2309 are bore code 09, so 09 × 5 = 45 mm bore. The 100 mm OD and 36 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2309?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2309 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2309 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2309-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2309 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2309 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2309 ECP",
      "NU2309 ECP"
    ]
  },
  {
    "sku": "NU2310",
    "brand": "SKF",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 186,
    "static_load_kN": 186,
    "fatigue_load_limit_kN": 24.5,
    "max_rpm": 8000,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 8000,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2310 ECP",
    "naming_rule_text": "NU2310 is a single-row cylindrical roller bearing in the NU2300 family: line-contact rollers between ground inner and outer raceways, separated by a glass-fibre reinforced polyamide (PA66) cage, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: NU2310 means cylindrical-roller type NU, wide series 23, 50 mm bore — which is why the 110×40 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Selection arithmetic: the C0/C ratio is about 1.00 (static 186 kN against dynamic 186 kN), typical of a cylindrical roller sized for high radial capacity, and the 24.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. When press-fitting the inner ring, support the ring face squarely; cocking the ring over a keyway or burr brinells the raceway and shows as vibration within the first running hours.",
    "applications": [
      "industrial gearbox input/output shafts",
      "pump and compressor drive shafts",
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "On this 50 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2300 series at 50 mm bore (110×40 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "Catalogue reference speed and limiting speed are different limits: the 6,700 r/min reference is a thermal criterion under load, while the 8,000 r/min limiting value is the mechanical ceiling — observe both.",
      "The 186/186 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2310 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2310 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2310?",
        "a": "The NU 2310 ECP is a single-row cylindrical roller bearing with 50 mm bore, 110 mm outer diameter and 40 mm width (1.969 × 4.331 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 186 kN, C0 186 kN, fatigue load limit Pu 24.5 kN, reference speed 6,700 r/min, limiting speed 8,000 r/min, mass about 1750 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2310 bore code work?",
        "a": "The last two digits of NU2310 are bore code 10, so 10 × 5 = 50 mm bore. The 110 mm OD and 40 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2310?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2310 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2310 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2310-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2310 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2310 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2310 ECP",
      "NU2310 ECP"
    ]
  },
  {
    "sku": "NU2311",
    "brand": "SKF",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 232,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 30.5,
    "max_rpm": 7000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 7000,
    "weight_g": 2250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2311 ECP",
    "naming_rule_text": "The NU 2311 ECP is a 55×120×43 mm single-row cylindrical roller bearing — the wide entry in the NU2300 series, with separable inner ring and roller assembly for easy mounting. On the SKF nameplate, NU2311 follows the ISO 15 convention: NU for the separable-inner-ring type, 23 for the wide, final digits 11 for the 55 mm bore. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 32.5 mm radial section height ((120−55)/2) and 2250 g catalogue mass frame a 55 mm bore bearing rated at 232 kN C — roughly 4.22 kN of dynamic capacity per millimetre of bore before application factors. The outer ring has no ribs and cannot locate the shaft axially; pair NU2311 with a locating bearing (e.g. deep-groove ball or angular contact) or use an NJ/NUP variant if one-direction location is required.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "machine-tool main spindles (radial set)",
      "paper-machine wet-section rolls",
      "rolling-mill auxiliary gear trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "On this 55 mm bore, thermal expansion of the shaft can preload the inner ring if the fit is too tight; calculate the residual interference at operating temperature and confirm the outer ring can still slide axially in the housing.",
      "The NU2300 series at 55 mm bore (120×43 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "The NU2311 shares its ISO 15 envelope with other cylindrical bearings of the same code but is not a drop-in replacement for a ball bearing: it has no axial load capacity in the NU design, and a deep-groove bearing cannot replace its radial-capacity duty.",
      "Open NU2311 units need application-supplied sealing and a defined lubricant supply; the line-contact hertz stress is higher than point contact, so film thickness is the first failure mode when viscosity drops.",
      "The 232/232 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2311 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2311 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2311?",
        "a": "The NU 2311 ECP is a single-row cylindrical roller bearing with 55 mm bore, 120 mm outer diameter and 43 mm width (2.165 × 4.724 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 232 kN, C0 232 kN, fatigue load limit Pu 30.5 kN, reference speed 6,000 r/min, limiting speed 7,000 r/min, mass about 2250 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2311 bore code work?",
        "a": "The last two digits of NU2311 are bore code 11, so 11 × 5 = 55 mm bore. The 120 mm OD and 43 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2311?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2311 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2311 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2311 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2311 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2311 ECP",
      "NU2311 ECP"
    ]
  },
  {
    "sku": "NU2312",
    "brand": "SKF",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 260,
    "static_load_kN": 265,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 6700,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6700,
    "weight_g": 2750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "manufacturer_designation": "NU 2312 ECP",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, NU2312 appears as NU 2312 ECP: an open, single-row cylindrical roller bearing in the NU2300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. The code breaks down as type prefix NU (inner ring separable, no outer-ring ribs), series 23 (the wide), and bore code 12 = 60 mm; dimensions 60×130×46 mm therefore match the ISO 15 envelope. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. Catalogue mass 2750 g for the 60×130×46 mm open execution covers the polymer cage and standard roller complement; steel or brass cage variants differ slightly in mass and carry their own order numbers. Fit selection follows the rotating ring — interference on a rotating inner ring — and the outer ring is free to slide axially in the housing; a 60 mm shaft typically takes a k5 seat with an H6 housing bore.",
    "applications": [
      "cement-kiln support-roller shafts",
      "wind-turbine gearbox intermediate shafts",
      "marine propulsion gearbox shafts",
      "heavy industrial gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Mount the 60 mm bore NU2312 by induction heating of the inner ring (max 120 °C — the polymer cage sets the ceiling, not the steel); driving it home through the rollers brinells the raceway.",
      "The NU2300 series at 60 mm bore (130×46 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.",
      "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.",
      "The ECP polymer cage is rated for standard industrial service up to 120 °C; sustained running above the limiting speed or with degraded lubricant softens the cage — inspect at every relubrication interval.",
      "The 260/265 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.",
      "SKF lists several executions of NU2312 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2312 ECP designation when purchasing and match the execution to the speed and temperature requirements."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2312?",
        "a": "The NU 2312 ECP is a single-row cylindrical roller bearing with 60 mm bore, 130 mm outer diameter and 46 mm width (2.362 × 5.118 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 260 kN, C0 265 kN, fatigue load limit Pu 34.5 kN, reference speed 5,600 r/min, limiting speed 6,700 r/min, mass about 2750 g. It is an open, separable bearing with a glass-fibre reinforced polyamide cage."
      },
      {
        "q": "How does the NU2312 bore code work?",
        "a": "The last two digits of NU2312 are bore code 12, so 12 × 5 = 60 mm bore. The 130 mm OD and 46 mm width come from the ISO 15 dimension-series plan, shared with other cylindrical bearings of the same code."
      },
      {
        "q": "What does the ECP suffix mean on NU2312?",
        "a": "ECP stands for a glass-fibre reinforced polyamide cage (PA66), the SKF standard for this size. Alternative executions include ECJ (pressed steel cage) and ECM (machined brass cage), which have different speed and temperature ratings and are separate order numbers."
      },
      {
        "q": "Can NU2312 take axial load?",
        "a": "No — the NU design has no ribs on the outer ring and cannot support axial load in either direction. It is intended for pure radial load with axial location provided by adjacent components. If axial location is required, consider NJ (one-direction) or NUP (two-direction) variants, or pair the NU bearing with a thrust or angular-contact bearing."
      },
      {
        "q": "How does NU2312 compare with a ball bearing of the same bore?",
        "a": "A cylindrical roller bearing has line contact and much higher radial capacity than a ball bearing of the same bore, but it cannot take axial load in the NU design and is sensitive to misalignment (≈ 3–4 minutes of arc). Speed limits are generally lower than deep-groove ball bearings. A ball bearing cannot be dropped into a pure radial cylindrical-roller position without re-checking life and deflection, and vice versa."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ2312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NJ 2312 ECP is a different execution with its own cage/flange configuration."
      },
      {
        "equiv_sku": "NUP2312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 boundary envelope and equivalent catalogue ratings; SKF NUP 2312 ECP is a different execution with its own cage/flange configuration."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NU2312 ECP",
      "NU2312 ECP"
    ]
  },
  {
    "sku": "319426-B-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319426 B-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 190,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 446,
    "static_load_kN": 815,
    "fatigue_load_limit_kN": 91.5,
    "max_rpm": 670,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 670,
    "weight_g": 7300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 130 mm shaft, SKF lists 319426-B-2LS as sealed double-row full-complement cylindrical roller: 190 mm OD, 80 mm wide, Pu 91.5 kN, with a sealed limiting speed of 670 r/min. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Selection arithmetic: C0/C ≈ 1.83 (815 against 446 kN), and the Pu figure 91.5 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 670 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore hook blocks and jib sheaves",
      "heavy dock and shipyard crane systems",
      "mining dragline and shovel rope sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "The 446/815 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319426-B-2LS?",
        "a": "SKF 319426 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 130 mm bore, 190 mm OD and 80 mm width per ISO 15. SKF lists C 446 kN, C0 815 kN, Pu 91.5 kN, limiting speed 670 r/min (sealed execution), mass about 7300 g. Inner-assembly width B1 is 79 mm."
      },
      {
        "q": "What does the NNF designation and B-2LS suffix mean?",
        "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319426-B-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319426-B-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319426",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319426-B-2LS",
      "SKF 319426 B-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319428-DA-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319428 DA-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 200,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 468,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 96.5,
    "max_rpm": 630,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 630,
    "weight_g": 8000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 319428 DA-2LS resolves to a 140×200×80 mm sealed double-row full-complement cylindrical roller bearing (dimension series 3194); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. With C 468 kN and C0 865 kN, size the bearing on the 140×200 mm ISO 15 envelope and check the 96.5 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 630 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Fit practice for 319428-DA-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining dragline and shovel rope sheaves",
      "large offshore hook blocks and jib sheaves",
      "heavy dock and shipyard crane systems"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "The 468/865 kN ratings are SKF catalogue 17000 (2018) values for the DA-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319428-DA-2LS?",
        "a": "SKF 319428 DA-2LS is a sealed double-row full-complement cylindrical roller bearing with 140 mm bore, 200 mm OD and 80 mm width per ISO 15. SKF lists C 468 kN, C0 865 kN, Pu 96.5 kN, limiting speed 630 r/min (sealed execution), mass about 8000 g. Inner-assembly width B1 is 79 mm."
      },
      {
        "q": "What does the NNF designation and DA-2LS suffix mean?",
        "a": "The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319428-DA-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319428-DA-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319428",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319428-DA-2LS",
      "SKF 319428 DA-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319430-B-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319430 B-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 210,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 484,
    "static_load_kN": 915,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 600,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 600,
    "weight_g": 8400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 319430 B-2LS is a sealed double-row full-complement cylindrical roller bearing sized 150×210×80 mm — a dimension series 3194, listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Load-per-bore for the 150 mm seat is about 3.23 kN/mm, typical of dimension series 3194; use C0 915 kN for static checks such as crane hook blocks standing under load. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large offshore hook blocks and jib sheaves",
      "heavy dock and shipyard crane systems",
      "mining dragline and shovel rope sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.",
      "The 484/915 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319430-B-2LS?",
        "a": "SKF 319430 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 150 mm bore, 210 mm OD and 80 mm width per ISO 15. SKF lists C 484 kN, C0 915 kN, Pu 100 kN, limiting speed 600 r/min (sealed execution), mass about 8400 g. Inner-assembly width B1 is 79 mm."
      },
      {
        "q": "What does the NNF designation and B-2LS suffix mean?",
        "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319430-B-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319430-B-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319430",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319430-B-2LS",
      "SKF 319430 B-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319432-DA-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319432 DA-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 501,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 106,
    "max_rpm": 530,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 530,
    "weight_g": 8800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 319432 DA-2LS is a sealed double-row full-complement cylindrical roller bearing sized 160×220×80 mm — a dimension series 3194, listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing.  The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix DA-2LS: contact seals on both sides in the DA ring configuration, delivered grease-packed. Selection arithmetic: C0/C ≈ 2.00 (1000 against 501 kN), and the Pu figure 106 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 530 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore hook blocks and jib sheaves",
      "heavy dock and shipyard crane systems",
      "mining dragline and shovel rope sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 501/1000 kN ratings are SKF catalogue 17000 (2018) values for the DA-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319432-DA-2LS?",
        "a": "SKF 319432 DA-2LS is a sealed double-row full-complement cylindrical roller bearing with 160 mm bore, 220 mm OD and 80 mm width per ISO 15. SKF lists C 501 kN, C0 1000 kN, Pu 106 kN, limiting speed 530 r/min (sealed execution), mass about 8800 g. Inner-assembly width B1 is 79 mm."
      },
      {
        "q": "What does the NNF designation and DA-2LS suffix mean?",
        "a": "The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319432-DA-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319432-DA-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319432",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319432-DA-2LS",
      "SKF 319432 DA-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319434-B-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319434 B-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 512,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 110,
    "max_rpm": 530,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 530,
    "weight_g": 9200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF 319434 B-2LS is a sealed double-row full-complement cylindrical roller bearing sized 170×230×80 mm — a dimension series 3194, listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing.  The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The radial section height is 30.0 mm and the catalogue mass 9200 g; at 512 kN dynamic rating this is roughly 3.01 kN of C per millimetre of bore before application factors. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy dock and shipyard crane systems",
      "mining dragline and shovel rope sheaves",
      "large offshore hook blocks and jib sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 512/1060 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319434-B-2LS?",
        "a": "SKF 319434 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 170 mm bore, 230 mm OD and 80 mm width per ISO 15. SKF lists C 512 kN, C0 1060 kN, Pu 110 kN, limiting speed 530 r/min (sealed execution), mass about 9200 g. Inner-assembly width B1 is 79 mm."
      },
      {
        "q": "What does the NNF designation and B-2LS suffix mean?",
        "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319434-B-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319434-B-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319434",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319434-B-2LS",
      "SKF 319434 B-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319436-DA-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319436 DA-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 528,
    "static_load_kN": 1100,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 480,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 480,
    "weight_g": 9800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 319436 DA-2LS resolves to a 180×240×80 mm sealed double-row full-complement cylindrical roller bearing (dimension series 3194); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Selection arithmetic: C0/C ≈ 2.08 (1100 against 528 kN), and the Pu figure 114 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 480 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining dragline and shovel rope sheaves",
      "large offshore hook blocks and jib sheaves",
      "heavy dock and shipyard crane systems"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "The 528/1100 kN ratings are SKF catalogue 17000 (2018) values for the DA-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319436-DA-2LS?",
        "a": "SKF 319436 DA-2LS is a sealed double-row full-complement cylindrical roller bearing with 180 mm bore, 240 mm OD and 80 mm width per ISO 15. SKF lists C 528 kN, C0 1100 kN, Pu 114 kN, limiting speed 480 r/min (sealed execution), mass about 9800 g. Inner-assembly width B1 is 79 mm."
      },
      {
        "q": "What does the NNF designation and DA-2LS suffix mean?",
        "a": "The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319436-DA-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319436-DA-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319436",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319436-DA-2LS",
      "SKF 319436 DA-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319438-DA-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319438 DA-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 550,
    "static_load_kN": 1180,
    "fatigue_load_limit_kN": 120,
    "max_rpm": 450,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 450,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "319438-DA-2LS is the 190 mm bore entry in the NNF4900 range: a 190×260×80 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 550 kN / C0 1180 kN. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing.  The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix DA-2LS: contact seals on both sides in the DA ring configuration, delivered grease-packed. Selection arithmetic: C0/C ≈ 2.15 (1180 against 550 kN), and the Pu figure 120 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 450 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore hook blocks and jib sheaves",
      "heavy dock and shipyard crane systems",
      "mining dragline and shovel rope sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 550/1180 kN ratings are SKF catalogue 17000 (2018) values for the DA-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319438-DA-2LS?",
        "a": "SKF 319438 DA-2LS is a sealed double-row full-complement cylindrical roller bearing with 190 mm bore, 260 mm OD and 80 mm width per ISO 15. SKF lists C 550 kN, C0 1180 kN, Pu 120 kN, limiting speed 450 r/min (sealed execution), mass about 12500 g. Inner-assembly width B1 is 79 mm."
      },
      {
        "q": "What does the NNF designation and DA-2LS suffix mean?",
        "a": "The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319438-DA-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319438-DA-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319438",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319438-DA-2LS",
      "SKF 319438 DA-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319440-B-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319440 B-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 270,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 583,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 137,
    "max_rpm": 430,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 430,
    "weight_g": 13000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "319440-B-2LS is the 200 mm bore entry in the NNF4900 range: a 200×270×80 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 583 kN / C0 1370 kN. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing.  The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Selection arithmetic: C0/C ≈ 2.35 (1370 against 583 kN), and the Pu figure 137 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 430 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Fit practice for 319440-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large offshore hook blocks and jib sheaves",
      "heavy dock and shipyard crane systems",
      "mining dragline and shovel rope sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.",
      "The 583/1370 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319440-B-2LS?",
        "a": "SKF 319440 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 200 mm bore, 270 mm OD and 80 mm width per ISO 15. SKF lists C 583 kN, C0 1370 kN, Pu 137 kN, limiting speed 430 r/min (sealed execution), mass about 13000 g. Inner-assembly width B1 is 79 mm."
      },
      {
        "q": "What does the NNF designation and B-2LS suffix mean?",
        "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319440-B-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319440-B-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319440",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319440-B-2LS",
      "SKF 319440 B-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319444-B-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319444 B-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 880,
    "static_load_kN": 1860,
    "fatigue_load_limit_kN": 190,
    "max_rpm": 380,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 380,
    "weight_g": 19000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "319444-B-2LS is the 220 mm bore entry in the NNF4900 range: a 220×300×95 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 880 kN / C0 1860 kN. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. With C 880 kN and C0 1860 kN, size the bearing on the 220×300 mm ISO 15 envelope and check the 190 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 380 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy dock and shipyard crane systems",
      "mining dragline and shovel rope sheaves",
      "large offshore hook blocks and jib sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (94 mm inner-assembly width) differs from the overall B 95 mm; check housing and spacer geometry against both values.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 880/1860 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319444-B-2LS?",
        "a": "SKF 319444 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 220 mm bore, 300 mm OD and 95 mm width per ISO 15. SKF lists C 880 kN, C0 1860 kN, Pu 190 kN, limiting speed 380 r/min (sealed execution), mass about 19000 g. Inner-assembly width B1 is 94 mm."
      },
      {
        "q": "What does the NNF designation and B-2LS suffix mean?",
        "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319444-B-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319444-B-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319444",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319444-B-2LS",
      "SKF 319444 B-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319448-B-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319448 B-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 952,
    "static_load_kN": 2040,
    "fatigue_load_limit_kN": 200,
    "max_rpm": 360,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 360,
    "weight_g": 20000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF 319448 B-2LS resolves to a 240×320×95 mm sealed double-row full-complement cylindrical roller bearing (dimension series 3194); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Speed planning for 319448-B-2LS: SKF publishes only a limiting speed of 360 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 20000 g covers the complete catalogue execution including factory grease fill and both seals. Fit practice for 319448-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy dock and shipyard crane systems",
      "mining dragline and shovel rope sheaves",
      "large offshore hook blocks and jib sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (94 mm inner-assembly width) differs from the overall B 95 mm; check housing and spacer geometry against both values.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 952/2040 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319448-B-2LS?",
        "a": "SKF 319448 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 240 mm bore, 320 mm OD and 95 mm width per ISO 15. SKF lists C 952 kN, C0 2040 kN, Pu 200 kN, limiting speed 360 r/min (sealed execution), mass about 20000 g. Inner-assembly width B1 is 94 mm."
      },
      {
        "q": "What does the NNF designation and B-2LS suffix mean?",
        "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319448-B-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319448-B-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319448",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319448-B-2LS",
      "SKF 319448 B-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "319452-B-2LS",
    "brand": "SKF",
    "manufacturer_designation": "SKF 319452 B-2LS",
    "series": "NNF4900-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 340,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "2RS",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 990,
    "static_load_kN": 2160,
    "fatigue_load_limit_kN": 212,
    "max_rpm": 340,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 340,
    "weight_g": 22000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "319452-B-2LS is the 260 mm bore entry in the NNF4900 range: a 260×340×95 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 990 kN / C0 2160 kN. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing.  The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Speed planning for 319452-B-2LS: SKF publishes only a limiting speed of 340 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 22000 g covers the complete catalogue execution including factory grease fill and both seals. Fit practice for 319452-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining dragline and shovel rope sheaves",
      "large offshore hook blocks and jib sheaves",
      "heavy dock and shipyard crane systems"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.",
      "The B1 width (94 mm inner-assembly width) differs from the overall B 95 mm; check housing and spacer geometry against both values.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.",
      "The 990/2160 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 319452-B-2LS?",
        "a": "SKF 319452 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 260 mm bore, 340 mm OD and 95 mm width per ISO 15. SKF lists C 990 kN, C0 2160 kN, Pu 212 kN, limiting speed 340 r/min (sealed execution), mass about 22000 g. Inner-assembly width B1 is 94 mm."
      },
      {
        "q": "What does the NNF designation and B-2LS suffix mean?",
        "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed."
      },
      {
        "q": "Can 319452-B-2LS take axial load and locate the shaft?",
        "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions."
      },
      {
        "q": "How does 319452-B-2LS compare with the other executions in the same envelope?",
        "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling."
      },
      {
        "q": "Does the sealed NNF bearing need relubrication?",
        "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "319452",
        "equiv_brand": "ISO 15",
        "level": "verify",
        "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "319452-B-2LS",
      "SKF 319452 B-2LS"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N203-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 203 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 20,
    "static_load_kN": 14.3,
    "fatigue_load_limit_kN": 1.73,
    "max_rpm": 22000,
    "reference_speed_rpm": 20000,
    "limiting_speed_rpm": 22000,
    "weight_g": 66,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 17 mm shaft, SKF lists N203-ECP as single-row caged cylindrical roller: 40 mm OD, 12 mm wide, Pu 1.73 kN, the catalogue lists 20,000 r/min thermal reference speed and 22,000 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.72 (14.3 against 20 kN), and the Pu figure 1.73 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 20,000 r/min thermal reference speed and 22,000 r/min mechanical limiting speed. Fit practice for N203-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "small industrial electric-motor shafts",
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 203, but flange configuration and axial-locating behaviour differ — quote the full SKF N 203 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 12 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 40 mm raceway.",
      "The 20/14.3 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N203-ECP?",
        "a": "SKF N 203 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 40 mm OD and 12 mm width per ISO 15. SKF lists C 20 kN, C0 14.3 kN, Pu 1.73 kN, reference speed 20,000 r/min and limiting speed 22,000 r/min, mass about 66 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N203-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N203-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ203-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU203-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP203-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N203-ECP",
      "SKF N 203 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N204-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 204 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 28.5,
    "static_load_kN": 22,
    "fatigue_load_limit_kN": 2.75,
    "max_rpm": 19000,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 19000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF N 204 ECP is a single-row caged cylindrical roller bearing sized 20×47×14 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 13.5 mm and the catalogue mass 110 g; at 28.5 kN dynamic rating this is roughly 1.43 kN of C per millimetre of bore before application factors. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 20 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts",
      "small pump rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 204, but flange configuration and axial-locating behaviour differ — quote the full SKF N 204 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 47 mm raceway.",
      "The 28.5/22 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N204-ECP?",
        "a": "SKF N 204 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 47 mm OD and 14 mm width per ISO 15. SKF lists C 28.5 kN, C0 22 kN, Pu 2.75 kN, reference speed 17,000 r/min and limiting speed 19,000 r/min, mass about 110 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N204-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N204-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ204-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP204-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N204-ECP",
      "SKF N 204 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N205-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 205 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 27,
    "fatigue_load_limit_kN": 3.35,
    "max_rpm": 16000,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 16000,
    "weight_g": 130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF N 205 ECP is a single-row caged cylindrical roller bearing sized 25×52×15 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 32.5 kN and C0 27 kN, size the bearing on the 25×52 mm ISO 15 envelope and check the 3.35 kN Pu against the equivalent-load floor; the catalogue lists 15,000 r/min thermal reference speed and 16,000 r/min mechanical limiting speed. Fit practice for N205-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts",
      "small pump rotor shafts",
      "small industrial electric-motor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 205, but flange configuration and axial-locating behaviour differ — quote the full SKF N 205 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 52 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 52 mm raceway.",
      "The 32.5/27 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N205-ECP?",
        "a": "SKF N 205 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 52 mm OD and 15 mm width per ISO 15. SKF lists C 32.5 kN, C0 27 kN, Pu 3.35 kN, reference speed 15,000 r/min and limiting speed 16,000 r/min, mass about 130 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N205-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N205-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N205-ECP",
      "SKF N 205 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N206-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 206 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 44,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 4.5,
    "max_rpm": 14000,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 14000,
    "weight_g": 200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 206 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 30×62×16 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 200 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 30 mm seat is about 1.47 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 36.5 kN for static checks such as crane hook blocks standing under load. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 30 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 206, but flange configuration and axial-locating behaviour differ — quote the full SKF N 206 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.",
      "The 44/36.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N206-ECP?",
        "a": "SKF N 206 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 62 mm OD and 16 mm width per ISO 15. SKF lists C 44 kN, C0 36.5 kN, Pu 4.5 kN, reference speed 13,000 r/min and limiting speed 14,000 r/min, mass about 200 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N206-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N206-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N206-ECP",
      "SKF N 206 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N207-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 207 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 56,
    "static_load_kN": 48,
    "fatigue_load_limit_kN": 6.1,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 207 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 35×72×17 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 300 g. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.86 (48 against 56 kN), and the Pu figure 6.1 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 11,000 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. Fit practice for N207-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 207, but flange configuration and axial-locating behaviour differ — quote the full SKF N 207 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.",
      "The 56/48 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N207-ECP?",
        "a": "SKF N 207 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 72 mm OD and 17 mm width per ISO 15. SKF lists C 56 kN, C0 48 kN, Pu 6.1 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 300 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N207-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N207-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N207-ECP",
      "SKF N 207 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N208-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 208 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 62,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 6.7,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF N 208 ECP resolves to a 40×80×18 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 20.0 mm and the catalogue mass 370 g; at 62 kN dynamic rating this is roughly 1.55 kN of C per millimetre of bore before application factors. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 208, but flange configuration and axial-locating behaviour differ — quote the full SKF N 208 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.",
      "The 62/53 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N208-ECP?",
        "a": "SKF N 208 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 80 mm OD and 18 mm width per ISO 15. SKF lists C 62 kN, C0 53 kN, Pu 6.7 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 370 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N208-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N208-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N208",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N208-ECP",
      "SKF N 208 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N209-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 209 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 8.15,
    "max_rpm": 9500,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 9500,
    "weight_g": 430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N209-ECP is the 45 mm bore entry in the N200 range: a 45×85×19 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 69.5 kN / C0 64 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. With C 69.5 kN and C0 64 kN, size the bearing on the 45×85 mm ISO 15 envelope and check the 8.15 kN Pu against the equivalent-load floor; the catalogue lists 9,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 209, but flange configuration and axial-locating behaviour differ — quote the full SKF N 209 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 85 mm raceway.",
      "The 69.5/64 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N209-ECP?",
        "a": "SKF N 209 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 85 mm OD and 19 mm width per ISO 15. SKF lists C 69.5 kN, C0 64 kN, Pu 8.15 kN, reference speed 9,000 r/min and limiting speed 9,500 r/min, mass about 430 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N209-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N209-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N209",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N209-ECP",
      "SKF N 209 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N210-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 210 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 8.8,
    "max_rpm": 9000,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 9000,
    "weight_g": 480,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 210 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 50×90×20 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 480 g. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for N210-ECP: the catalogue lists 8,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. The mass entry 480 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 50 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 210, but flange configuration and axial-locating behaviour differ — quote the full SKF N 210 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.",
      "The 73.5/69.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N210-ECP?",
        "a": "SKF N 210 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 90 mm OD and 20 mm width per ISO 15. SKF lists C 73.5 kN, C0 69.5 kN, Pu 8.8 kN, reference speed 8,500 r/min and limiting speed 9,000 r/min, mass about 480 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N210-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N210-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N210",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N210-ECP",
      "SKF N 210 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N211-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 211 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 96.5,
    "static_load_kN": 95,
    "fatigue_load_limit_kN": 12.2,
    "max_rpm": 8000,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8000,
    "weight_g": 650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 211 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 55×100×21 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 650 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 55 mm seat is about 1.75 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 95 kN for static checks such as crane hook blocks standing under load. Fit practice for N211-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 211, but flange configuration and axial-locating behaviour differ — quote the full SKF N 211 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.",
      "The 96.5/95 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N211-ECP?",
        "a": "SKF N 211 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 100 mm OD and 21 mm width per ISO 15. SKF lists C 96.5 kN, C0 95 kN, Pu 12.2 kN, reference speed 7,500 r/min and limiting speed 8,000 r/min, mass about 650 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N211-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N211-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N211",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU211",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N211-ECP",
      "SKF N 211 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N212-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 212 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 108,
    "static_load_kN": 102,
    "fatigue_load_limit_kN": 13.4,
    "max_rpm": 7500,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 7500,
    "weight_g": 790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF N 212 ECP resolves to a 60×110×22 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.94 (102 against 108 kN), and the Pu figure 13.4 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,700 r/min thermal reference speed and 7,500 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 212, but flange configuration and axial-locating behaviour differ — quote the full SKF N 212 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 22 mm-wide ring and concentrates load.",
      "The 108/102 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N212-ECP?",
        "a": "SKF N 212 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 110 mm OD and 22 mm width per ISO 15. SKF lists C 108 kN, C0 102 kN, Pu 13.4 kN, reference speed 6,700 r/min and limiting speed 7,500 r/min, mass about 790 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N212-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N212-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N212",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N212-ECP",
      "SKF N 212 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N213-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 213 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 122,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 15.6,
    "max_rpm": 6700,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6700,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N213-ECP is the 65 mm bore entry in the N200 range: a 65×120×23 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 122 kN / C0 118 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 122 kN and C0 118 kN, size the bearing on the 65×120 mm ISO 15 envelope and check the 15.6 kN Pu against the equivalent-load floor; the catalogue lists 6,300 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 213, but flange configuration and axial-locating behaviour differ — quote the full SKF N 213 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "The 122/118 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N213-ECP?",
        "a": "SKF N 213 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 120 mm OD and 23 mm width per ISO 15. SKF lists C 122 kN, C0 118 kN, Pu 15.6 kN, reference speed 6,300 r/min and limiting speed 6,700 r/min, mass about 1050 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N213-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N213-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N213",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ213-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP213-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU213",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N213-ECP",
      "SKF N 213 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N214-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 214 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 137,
    "static_load_kN": 137,
    "fatigue_load_limit_kN": 18,
    "max_rpm": 6300,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N214-ECP is the 70 mm bore entry in the N200 range: a 70×125×24 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 137 kN / C0 137 kN. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for N214-ECP: the catalogue lists 6,000 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. The mass entry 1100 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 214, but flange configuration and axial-locating behaviour differ — quote the full SKF N 214 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 24 mm-wide ring and concentrates load.",
      "The 137/137 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N214-ECP?",
        "a": "SKF N 214 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 125 mm OD and 24 mm width per ISO 15. SKF lists C 137 kN, C0 137 kN, Pu 18 kN, reference speed 6,000 r/min and limiting speed 6,300 r/min, mass about 1100 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N214-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N214-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N214",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ214-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP214-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU214",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N214-ECP",
      "SKF N 214 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N215-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 215 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 150,
    "static_load_kN": 156,
    "fatigue_load_limit_kN": 20.4,
    "max_rpm": 6000,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6000,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 75 mm shaft, SKF lists N215-ECP as single-row caged cylindrical roller: 130 mm OD, 25 mm wide, Pu 20.4 kN, the catalogue lists 5,600 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 75 mm seat is about 2.00 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 156 kN for static checks such as crane hook blocks standing under load. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 215, but flange configuration and axial-locating behaviour differ — quote the full SKF N 215 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.",
      "The 150/156 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N215-ECP?",
        "a": "SKF N 215 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 130 mm OD and 25 mm width per ISO 15. SKF lists C 150 kN, C0 156 kN, Pu 20.4 kN, reference speed 5,600 r/min and limiting speed 6,000 r/min, mass about 1200 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N215-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N215-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N215",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ215-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP215-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU215",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N215-ECP",
      "SKF N 215 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N216-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 216 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 160,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 21.2,
    "max_rpm": 5600,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5600,
    "weight_g": 1550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 80 mm shaft, SKF lists N216-ECP as single-row caged cylindrical roller: 140 mm OD, 26 mm wide, Pu 21.2 kN, the catalogue lists 5,300 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.04 (166 against 160 kN), and the Pu figure 21.2 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 5,300 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 216, but flange configuration and axial-locating behaviour differ — quote the full SKF N 216 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 26 mm-wide ring and concentrates load.",
      "The 160/166 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N216-ECP?",
        "a": "SKF N 216 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 140 mm OD and 26 mm width per ISO 15. SKF lists C 160 kN, C0 166 kN, Pu 21.2 kN, reference speed 5,300 r/min and limiting speed 5,600 r/min, mass about 1550 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N216-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N216-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N216",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ216-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP216-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N216-ECP",
      "SKF N 216 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N217-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 217 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 190,
    "static_load_kN": 200,
    "fatigue_load_limit_kN": 25,
    "max_rpm": 5300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5300,
    "weight_g": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF N 217 ECP is a single-row caged cylindrical roller bearing sized 85×150×28 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 32.5 mm and the catalogue mass 1900 g; at 190 kN dynamic rating this is roughly 2.24 kN of C per millimetre of bore before application factors. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 217, but flange configuration and axial-locating behaviour differ — quote the full SKF N 217 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 28 mm-wide ring and concentrates load.",
      "The 190/200 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N217-ECP?",
        "a": "SKF N 217 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 150 mm OD and 28 mm width per ISO 15. SKF lists C 190 kN, C0 200 kN, Pu 25 kN, reference speed 4,800 r/min and limiting speed 5,300 r/min, mass about 1900 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N217-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N217-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N217",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ217-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP217-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N217-ECP",
      "SKF N 217 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N218-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 218 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 208,
    "static_load_kN": 220,
    "fatigue_load_limit_kN": 27,
    "max_rpm": 5000,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 5000,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 218 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 90×160×30 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 2300 g. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 208 kN and C0 220 kN, size the bearing on the 90×160 mm ISO 15 envelope and check the 27 kN Pu against the equivalent-load floor; the catalogue lists 4,500 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Fit practice for N218-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 218, but flange configuration and axial-locating behaviour differ — quote the full SKF N 218 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.",
      "The 208/220 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N218-ECP?",
        "a": "SKF N 218 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 160 mm OD and 30 mm width per ISO 15. SKF lists C 208 kN, C0 220 kN, Pu 27 kN, reference speed 4,500 r/min and limiting speed 5,000 r/min, mass about 2300 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N218-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N218-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N218",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ218-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP218-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N218-ECP",
      "SKF N 218 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N219-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 219 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 255,
    "static_load_kN": 265,
    "fatigue_load_limit_kN": 32.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4800,
    "weight_g": 2850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 219 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 95×170×32 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 2850 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for N219-ECP: the catalogue lists 4,300 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 2850 g covers the complete catalogue execution. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 219, but flange configuration and axial-locating behaviour differ — quote the full SKF N 219 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 32 mm-wide ring and concentrates load.",
      "The 255/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N219-ECP?",
        "a": "SKF N 219 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 170 mm OD and 32 mm width per ISO 15. SKF lists C 255 kN, C0 265 kN, Pu 32.5 kN, reference speed 4,300 r/min and limiting speed 4,800 r/min, mass about 2850 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N219-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N219-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N219",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ219-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP219-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU219",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N219-ECP",
      "SKF N 219 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N220-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 220 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 285,
    "static_load_kN": 305,
    "fatigue_load_limit_kN": 36.5,
    "max_rpm": 4500,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4500,
    "weight_g": 3450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF N 220 ECP is a single-row caged cylindrical roller bearing sized 100×180×34 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 100 mm seat is about 2.85 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 305 kN for static checks such as crane hook blocks standing under load. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 220, but flange configuration and axial-locating behaviour differ — quote the full SKF N 220 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "The 285/305 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N220-ECP?",
        "a": "SKF N 220 ECP is a single-row caged cylindrical roller bearing with 100 mm bore, 180 mm OD and 34 mm width per ISO 15. SKF lists C 285 kN, C0 305 kN, Pu 36.5 kN, reference speed 4,000 r/min and limiting speed 4,500 r/min, mass about 3450 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N220-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N220-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N220",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ220-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP220-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N220-ECP",
      "SKF N 220 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N221-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 221 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 300,
    "static_load_kN": 315,
    "fatigue_load_limit_kN": 36.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4300,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF N 221 ECP is a single-row caged cylindrical roller bearing sized 105×190×36 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.05 (315 against 300 kN), and the Pu figure 36.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,800 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Fit practice for N221-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 221, but flange configuration and axial-locating behaviour differ — quote the full SKF N 221 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.",
      "The 300/315 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N221-ECP?",
        "a": "SKF N 221 ECP is a single-row caged cylindrical roller bearing with 105 mm bore, 190 mm OD and 36 mm width per ISO 15. SKF lists C 300 kN, C0 315 kN, Pu 36.5 kN, reference speed 3,800 r/min and limiting speed 4,300 r/min, mass about 3900 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N221-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N221-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N221",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ221-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU221-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP221-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N221-ECP",
      "SKF N 221 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N222-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 222 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 335,
    "static_load_kN": 365,
    "fatigue_load_limit_kN": 42.5,
    "max_rpm": 4000,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4000,
    "weight_g": 4800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 222 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 110×200×38 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 4800 g. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 45.0 mm and the catalogue mass 4800 g; at 335 kN dynamic rating this is roughly 3.05 kN of C per millimetre of bore before application factors. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 222, but flange configuration and axial-locating behaviour differ — quote the full SKF N 222 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 38 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "The 335/365 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N222-ECP?",
        "a": "SKF N 222 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 200 mm OD and 38 mm width per ISO 15. SKF lists C 335 kN, C0 365 kN, Pu 42.5 kN, reference speed 3,600 r/min and limiting speed 4,000 r/min, mass about 4800 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N222-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N222-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N222",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ222-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU222-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP222-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N222-ECP",
      "SKF N 222 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N224-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 224 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 390,
    "static_load_kN": 430,
    "fatigue_load_limit_kN": 49,
    "max_rpm": 3600,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3600,
    "weight_g": 5750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF N 224 ECP resolves to a 120×215×40 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for N224-ECP: the catalogue lists 3,400 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 5750 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 224, but flange configuration and axial-locating behaviour differ — quote the full SKF N 224 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.",
      "The 390/430 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N224-ECP?",
        "a": "SKF N 224 ECP is a single-row caged cylindrical roller bearing with 120 mm bore, 215 mm OD and 40 mm width per ISO 15. SKF lists C 390 kN, C0 430 kN, Pu 49 kN, reference speed 3,400 r/min and limiting speed 3,600 r/min, mass about 5750 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N224-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N224-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N224",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ224-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU224-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP224-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N224-ECP",
      "SKF N 224 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N226-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 226 ECP",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 415,
    "static_load_kN": 455,
    "fatigue_load_limit_kN": 51,
    "max_rpm": 3400,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 3400,
    "weight_g": 6450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N226-ECP is the 130 mm bore entry in the N200 range: a 130×230×40 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 415 kN / C0 455 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.10 (455 against 415 kN), and the Pu figure 51 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,200 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 226, but flange configuration and axial-locating behaviour differ — quote the full SKF N 226 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.",
      "The 415/455 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N226-ECP?",
        "a": "SKF N 226 ECP is a single-row caged cylindrical roller bearing with 130 mm bore, 230 mm OD and 40 mm width per ISO 15. SKF lists C 415 kN, C0 455 kN, Pu 51 kN, reference speed 3,200 r/min and limiting speed 3,400 r/min, mass about 6450 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N226-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N226-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N226",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ226-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU226-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP226-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N226-ECP",
      "SKF N 226 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N303-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 303 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 28.5,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 2.55,
    "max_rpm": 20000,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 20000,
    "weight_g": 120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N303-ECP is the 17 mm bore entry in the N300 range: a 17×47×14 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 28.5 kN / C0 20.4 kN. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 28.5 kN and C0 20.4 kN, size the bearing on the 17×47 mm ISO 15 envelope and check the 2.55 kN Pu against the equivalent-load floor; the catalogue lists 17,000 r/min thermal reference speed and 20,000 r/min mechanical limiting speed. Fit practice for N303-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts",
      "small pump rotor shafts",
      "small industrial electric-motor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 303, but flange configuration and axial-locating behaviour differ — quote the full SKF N 303 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 14 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 14 mm-wide ring and concentrates load.",
      "The 28.5/20.4 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N303-ECP?",
        "a": "SKF N 303 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 47 mm OD and 14 mm width per ISO 15. SKF lists C 28.5 kN, C0 20.4 kN, Pu 2.55 kN, reference speed 17,000 r/min and limiting speed 20,000 r/min, mass about 120 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N303-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N303-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ303-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×47×14 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU303-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×47×14 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N303-ECP",
      "SKF N 303 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N304-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 304 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.5,
    "static_load_kN": 26,
    "fatigue_load_limit_kN": 3.25,
    "max_rpm": 18000,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 18000,
    "weight_g": 150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N304-ECP is the 20 mm bore entry in the N300 range: a 20×52×15 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 35.5 kN / C0 26 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for N304-ECP: the catalogue lists 15,000 r/min thermal reference speed and 18,000 r/min mechanical limiting speed. The mass entry 150 g covers the complete catalogue execution. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "appliance and fan armature shafts",
      "small pump rotor shafts",
      "small industrial electric-motor shafts",
      "light gearbox layshafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 304, but flange configuration and axial-locating behaviour differ — quote the full SKF N 304 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 15 mm-wide ring and concentrates load.",
      "The 35.5/26 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N304-ECP?",
        "a": "SKF N 304 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 52 mm OD and 15 mm width per ISO 15. SKF lists C 35.5 kN, C0 26 kN, Pu 3.25 kN, reference speed 15,000 r/min and limiting speed 18,000 r/min, mass about 150 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N304-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N304-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ304-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP304-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU304",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N304-ECP",
      "SKF N 304 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N305-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 305 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 4.55,
    "max_rpm": 15000,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 15000,
    "weight_g": 230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 25 mm shaft, SKF lists N305-ECP as single-row caged cylindrical roller: 62 mm OD, 17 mm wide, Pu 4.55 kN, the catalogue lists 12,000 r/min thermal reference speed and 15,000 r/min mechanical limiting speed. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 25 mm seat is about 1.86 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 36.5 kN for static checks such as crane hook blocks standing under load. Fit practice for N305-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "small pump rotor shafts",
      "small industrial electric-motor shafts",
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 305, but flange configuration and axial-locating behaviour differ — quote the full SKF N 305 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 17 mm-wide ring and concentrates load.",
      "The 46.5/36.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N305-ECP?",
        "a": "SKF N 305 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 62 mm OD and 17 mm width per ISO 15. SKF lists C 46.5 kN, C0 36.5 kN, Pu 4.55 kN, reference speed 12,000 r/min and limiting speed 15,000 r/min, mass about 230 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N305-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N305-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N305-ECP",
      "SKF N 305 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N306-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 306 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 48,
    "fatigue_load_limit_kN": 6.2,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 360,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 30 mm shaft, SKF lists N306-ECP as single-row caged cylindrical roller: 72 mm OD, 19 mm wide, Pu 6.2 kN, the catalogue lists 11,000 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 21.0 mm and the catalogue mass 360 g; at 58.5 kN dynamic rating this is roughly 1.95 kN of C per millimetre of bore before application factors. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 306, but flange configuration and axial-locating behaviour differ — quote the full SKF N 306 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.",
      "The 58.5/48 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N306-ECP?",
        "a": "SKF N 306 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 72 mm OD and 19 mm width per ISO 15. SKF lists C 58.5 kN, C0 48 kN, Pu 6.2 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 360 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N306-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N306-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N306-ECP",
      "SKF N 306 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N307-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 307 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 75,
    "static_load_kN": 63,
    "fatigue_load_limit_kN": 8.15,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 480,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF N 307 ECP is a single-row caged cylindrical roller bearing sized 35×80×21 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 75 kN and C0 63 kN, size the bearing on the 35×80 mm ISO 15 envelope and check the 8.15 kN Pu against the equivalent-load floor; the catalogue lists 9,500 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. Fit practice for N307-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 307, but flange configuration and axial-locating behaviour differ — quote the full SKF N 307 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.",
      "The 75/63 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N307-ECP?",
        "a": "SKF N 307 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 80 mm OD and 21 mm width per ISO 15. SKF lists C 75 kN, C0 63 kN, Pu 8.15 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 480 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N307-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N307-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N307-ECP",
      "SKF N 307 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N308-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 308 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 93,
    "static_load_kN": 78,
    "fatigue_load_limit_kN": 10.2,
    "max_rpm": 9500,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 9500,
    "weight_g": 650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 308 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 40×90×23 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 650 g. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for N308-ECP: the catalogue lists 8,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The mass entry 650 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 308, but flange configuration and axial-locating behaviour differ — quote the full SKF N 308 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "The 93/78 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N308-ECP?",
        "a": "SKF N 308 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 90 mm OD and 23 mm width per ISO 15. SKF lists C 93 kN, C0 78 kN, Pu 10.2 kN, reference speed 8,000 r/min and limiting speed 9,500 r/min, mass about 650 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N308-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N308-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N308",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N308-ECP",
      "SKF N 308 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N309-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 309 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 112,
    "static_load_kN": 100,
    "fatigue_load_limit_kN": 12.9,
    "max_rpm": 8500,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8500,
    "weight_g": 880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 309 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 45×100×25 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 880 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 45 mm seat is about 2.49 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 100 kN for static checks such as crane hook blocks standing under load. Fit practice for N309-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 309, but flange configuration and axial-locating behaviour differ — quote the full SKF N 309 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.",
      "The 112/100 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N309-ECP?",
        "a": "SKF N 309 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 112 kN, C0 100 kN, Pu 12.9 kN, reference speed 7,500 r/min and limiting speed 8,500 r/min, mass about 880 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N309-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N309-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N309",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N309-ECP",
      "SKF N 309 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N310-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 310 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 127,
    "static_load_kN": 112,
    "fatigue_load_limit_kN": 15,
    "max_rpm": 8000,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 8000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 50 mm shaft, SKF lists N310-ECP as single-row caged cylindrical roller: 110 mm OD, 27 mm wide, Pu 15 kN, the catalogue lists 6,700 r/min thermal reference speed and 8,000 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.88 (112 against 127 kN), and the Pu figure 15 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,700 r/min thermal reference speed and 8,000 r/min mechanical limiting speed. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 310, but flange configuration and axial-locating behaviour differ — quote the full SKF N 310 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 27 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 127/112 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N310-ECP?",
        "a": "SKF N 310 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 110 mm OD and 27 mm width per ISO 15. SKF lists C 127 kN, C0 112 kN, Pu 15 kN, reference speed 6,700 r/min and limiting speed 8,000 r/min, mass about 1100 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N310-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N310-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N310",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N310-ECP",
      "SKF N 310 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N311-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 311 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 156,
    "static_load_kN": 143,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 7000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 7000,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF N 311 ECP is a single-row caged cylindrical roller bearing sized 55×120×29 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 32.5 mm and the catalogue mass 1450 g; at 156 kN dynamic rating this is roughly 2.84 kN of C per millimetre of bore before application factors. Fit practice for N311-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 311, but flange configuration and axial-locating behaviour differ — quote the full SKF N 311 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 156/143 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N311-ECP?",
        "a": "SKF N 311 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 120 mm OD and 29 mm width per ISO 15. SKF lists C 156 kN, C0 143 kN, Pu 18.6 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 1450 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N311-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N311-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N311",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N311-ECP",
      "SKF N 311 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N312-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 312 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 173,
    "static_load_kN": 160,
    "fatigue_load_limit_kN": 21.2,
    "max_rpm": 6700,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6700,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 312 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 60×130×31 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 1750 g. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 173 kN and C0 160 kN, size the bearing on the 60×130 mm ISO 15 envelope and check the 21.2 kN Pu against the equivalent-load floor; the catalogue lists 5,600 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 312, but flange configuration and axial-locating behaviour differ — quote the full SKF N 312 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 173/160 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N312-ECP?",
        "a": "SKF N 312 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 130 mm OD and 31 mm width per ISO 15. SKF lists C 173 kN, C0 160 kN, Pu 21.2 kN, reference speed 5,600 r/min and limiting speed 6,700 r/min, mass about 1750 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N312-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N312-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N312",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU312",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N312-ECP",
      "SKF N 312 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N313-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 313 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 212,
    "static_load_kN": 196,
    "fatigue_load_limit_kN": 25.5,
    "max_rpm": 6000,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 6000,
    "weight_g": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 313 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 65×140×33 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 2200 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 65 mm seat is about 3.26 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 196 kN for static checks such as crane hook blocks standing under load. Fit practice for N313-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 313, but flange configuration and axial-locating behaviour differ — quote the full SKF N 313 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 212/196 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N313-ECP?",
        "a": "SKF N 313 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 140 mm OD and 33 mm width per ISO 15. SKF lists C 212 kN, C0 196 kN, Pu 25.5 kN, reference speed 5,300 r/min and limiting speed 6,000 r/min, mass about 2200 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N313-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N313-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N313",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ313-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP313-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N313-ECP",
      "SKF N 313 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N314-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 314 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 236,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 29,
    "max_rpm": 5600,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5600,
    "weight_g": 2650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF N 314 ECP resolves to a 70×150×35 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.97 (228 against 236 kN), and the Pu figure 29 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,800 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 314, but flange configuration and axial-locating behaviour differ — quote the full SKF N 314 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 236/228 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N314-ECP?",
        "a": "SKF N 314 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 150 mm OD and 35 mm width per ISO 15. SKF lists C 236 kN, C0 228 kN, Pu 29 kN, reference speed 4,800 r/min and limiting speed 5,600 r/min, mass about 2650 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N314-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N314-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N314",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ314-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP314-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N314-ECP",
      "SKF N 314 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N315-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 315 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 280,
    "static_load_kN": 265,
    "fatigue_load_limit_kN": 33.5,
    "max_rpm": 5300,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 5300,
    "weight_g": 3300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF N 315 ECP resolves to a 75×160×37 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.95 (265 against 280 kN), and the Pu figure 33.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,500 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 75 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 315, but flange configuration and axial-locating behaviour differ — quote the full SKF N 315 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 37 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.",
      "The 280/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N315-ECP?",
        "a": "SKF N 315 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 160 mm OD and 37 mm width per ISO 15. SKF lists C 280 kN, C0 265 kN, Pu 33.5 kN, reference speed 4,500 r/min and limiting speed 5,300 r/min, mass about 3300 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N315-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N315-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N315",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ315-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP315-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N315-ECP",
      "SKF N 315 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N316-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 316 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 300,
    "static_load_kN": 290,
    "fatigue_load_limit_kN": 36,
    "max_rpm": 5000,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5000,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N316-ECP is the 80 mm bore entry in the N300 range: a 80×170×39 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 300 kN / C0 290 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 45.0 mm and the catalogue mass 3900 g; at 300 kN dynamic rating this is roughly 3.75 kN of C per millimetre of bore before application factors. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 316, but flange configuration and axial-locating behaviour differ — quote the full SKF N 316 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.",
      "The 300/290 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N316-ECP?",
        "a": "SKF N 316 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 170 mm OD and 39 mm width per ISO 15. SKF lists C 300 kN, C0 290 kN, Pu 36 kN, reference speed 4,300 r/min and limiting speed 5,000 r/min, mass about 3900 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N316-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N316-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N316",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ316-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP316-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N316-ECP",
      "SKF N 316 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N317-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 317 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 340,
    "static_load_kN": 335,
    "fatigue_load_limit_kN": 41.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4800,
    "weight_g": 4550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 85 mm shaft, SKF lists N317-ECP as single-row caged cylindrical roller: 180 mm OD, 41 mm wide, Pu 41.5 kN, the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 340 kN and C0 335 kN, size the bearing on the 85×180 mm ISO 15 envelope and check the 41.5 kN Pu against the equivalent-load floor; the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Fit practice for N317-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 317, but flange configuration and axial-locating behaviour differ — quote the full SKF N 317 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "The 340/335 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N317-ECP?",
        "a": "SKF N 317 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 180 mm OD and 41 mm width per ISO 15. SKF lists C 340 kN, C0 335 kN, Pu 41.5 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 4550 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N317-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N317-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N317",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ317-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP317-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N317-ECP",
      "SKF N 317 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N318-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 318 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 365,
    "static_load_kN": 360,
    "fatigue_load_limit_kN": 43,
    "max_rpm": 4500,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4500,
    "weight_g": 5300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 90 mm shaft, SKF lists N318-ECP as single-row caged cylindrical roller: 190 mm OD, 43 mm wide, Pu 43 kN, the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for N318-ECP: the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 5300 g covers the complete catalogue execution. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 318, but flange configuration and axial-locating behaviour differ — quote the full SKF N 318 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.",
      "The 365/360 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N318-ECP?",
        "a": "SKF N 318 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 190 mm OD and 43 mm width per ISO 15. SKF lists C 365 kN, C0 360 kN, Pu 43 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 5300 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N318-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N318-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N318",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ318-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP318-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N318-ECP",
      "SKF N 318 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N319-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 319 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 390,
    "static_load_kN": 390,
    "fatigue_load_limit_kN": 46.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4300,
    "weight_g": 6200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF N 319 ECP is a single-row caged cylindrical roller bearing sized 95×200×45 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.00 (390 against 390 kN), and the Pu figure 46.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,600 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Fit practice for N319-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 319, but flange configuration and axial-locating behaviour differ — quote the full SKF N 319 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "The 390/390 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N319-ECP?",
        "a": "SKF N 319 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 200 mm OD and 45 mm width per ISO 15. SKF lists C 390 kN, C0 390 kN, Pu 46.5 kN, reference speed 3,600 r/min and limiting speed 4,300 r/min, mass about 6200 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N319-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N319-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N319",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ319-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP319-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N319-ECP",
      "SKF N 319 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N320-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 320 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 450,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 51,
    "max_rpm": 3800,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 3800,
    "weight_g": 7350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N320-ECP is the 100 mm bore entry in the N300 range: a 100×215×47 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 450 kN / C0 440 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 57.5 mm and the catalogue mass 7350 g; at 450 kN dynamic rating this is roughly 4.50 kN of C per millimetre of bore before application factors. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 320, but flange configuration and axial-locating behaviour differ — quote the full SKF N 320 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 47 mm-wide ring and concentrates load.",
      "The 450/440 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N320-ECP?",
        "a": "SKF N 320 ECP is a single-row caged cylindrical roller bearing with 100 mm bore, 215 mm OD and 47 mm width per ISO 15. SKF lists C 450 kN, C0 440 kN, Pu 51 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 7350 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N320-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N320-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N320",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ320-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP320-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N320-ECP",
      "SKF N 320 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N321-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 321 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 105,
    "D_mm": 225,
    "B_mm": 49,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 500,
    "static_load_kN": 500,
    "fatigue_load_limit_kN": 57,
    "max_rpm": 3800,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 3800,
    "weight_g": 8600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 105 mm shaft, SKF lists N321-ECP as single-row caged cylindrical roller: 225 mm OD, 49 mm wide, Pu 57 kN, the catalogue lists 3,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 500 kN and C0 500 kN, size the bearing on the 105×225 mm ISO 15 envelope and check the 57 kN Pu against the equivalent-load floor; the catalogue lists 3,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Fit practice for N321-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 321, but flange configuration and axial-locating behaviour differ — quote the full SKF N 321 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 225 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 49 mm-wide ring and concentrates load.",
      "The 500/500 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N321-ECP?",
        "a": "SKF N 321 ECP is a single-row caged cylindrical roller bearing with 105 mm bore, 225 mm OD and 49 mm width per ISO 15. SKF lists C 500 kN, C0 500 kN, Pu 57 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 8600 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N321-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N321-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N321",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ321-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×225×49 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU321-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×225×49 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N321-ECP",
      "SKF N 321 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N322-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 322 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 530,
    "static_load_kN": 540,
    "fatigue_load_limit_kN": 61,
    "max_rpm": 3400,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3400,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 110 mm shaft, SKF lists N322-ECP as single-row caged cylindrical roller: 240 mm OD, 50 mm wide, Pu 61 kN, the catalogue lists 3,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for N322-ECP: the catalogue lists 3,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The mass entry 10000 g covers the complete catalogue execution. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 322, but flange configuration and axial-locating behaviour differ — quote the full SKF N 322 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.",
      "The 530/540 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N322-ECP?",
        "a": "SKF N 322 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 240 mm OD and 50 mm width per ISO 15. SKF lists C 530 kN, C0 540 kN, Pu 61 kN, reference speed 3,000 r/min and limiting speed 3,400 r/min, mass about 10000 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N322-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N322-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N322",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ322-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU322-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP322-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N322-ECP",
      "SKF N 322 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N324-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 324 ECP",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 610,
    "static_load_kN": 620,
    "fatigue_load_limit_kN": 69.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3200,
    "weight_g": 13000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 324 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 120×260×55 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 13000 g. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.02 (620 against 610 kN), and the Pu figure 69.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,800 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 324, but flange configuration and axial-locating behaviour differ — quote the full SKF N 324 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 55 mm-wide ring and concentrates load.",
      "The 610/620 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N324-ECP?",
        "a": "SKF N 324 ECP is a single-row caged cylindrical roller bearing with 120 mm bore, 260 mm OD and 55 mm width per ISO 15. SKF lists C 610 kN, C0 620 kN, Pu 69.5 kN, reference speed 2,800 r/min and limiting speed 3,200 r/min, mass about 13000 g."
      },
      {
        "q": "What does the N designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N324-ECP take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N324-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N324",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ324-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU324-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP324-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N324-ECP",
      "SKF N 324 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N326-ECM",
    "brand": "SKF",
    "manufacturer_designation": "SKF N 326 ECM",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 720,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 81.5,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N326-ECM is the 130 mm bore entry in the N300 range: a 130×280×58 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 720 kN / C0 750 kN. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for N326-ECM: the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The mass entry 18000 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a N bearing where axial load must be carried — the design carries radial load only",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 326, but flange configuration and axial-locating behaviour differ — quote the full SKF N 326 ECM and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.",
      "The 720/750 kN ratings are SKF catalogue 17000 (2018) values for the ECM execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N326-ECM?",
        "a": "SKF N 326 ECM is a single-row caged cylindrical roller bearing with 130 mm bore, 280 mm OD and 58 mm width per ISO 15. SKF lists C 720 kN, C0 750 kN, Pu 81.5 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 18000 g."
      },
      {
        "q": "What does the N designation and ECM suffix mean?",
        "a": "The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part."
      },
      {
        "q": "Can N326-ECM take axial load and locate the shaft?",
        "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing."
      },
      {
        "q": "How does N326-ECM compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N326",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NJ326-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU326-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP326-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "N326-ECM",
      "SKF N 326 ECM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-500-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/500 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 620,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 952,
    "static_load_kN": 2120,
    "fatigue_load_limit_kN": 173,
    "max_rpm": 480,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 480,
    "weight_g": 35500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 500 mm shaft, SKF lists NCF18-500-V as single-row full-complement cylindrical roller: 620 mm OD, 56 mm wide, Pu 173 kN, the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 952 kN and C0 2120 kN, size the bearing on the 500×620 mm ISO 15 envelope and check the 173 kN Pu against the equivalent-load floor; the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 500 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 480 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 952/2120 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-500-V?",
        "a": "SKF NCF 18/500 V is a single-row full-complement cylindrical roller bearing with 500 mm bore, 620 mm OD and 56 mm width per ISO 15. SKF lists C 952 kN, C0 2120 kN, Pu 173 kN, reference speed 380 r/min and limiting speed 480 r/min, mass about 35500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-500-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-500-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-500-V",
      "SKF NCF 18/500 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-530-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/530 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 530,
    "D_mm": 650,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 990,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 180,
    "max_rpm": 450,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 450,
    "weight_g": 38500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 18/530 V resolves to a 530×650×56 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 530 mm seat is about 1.87 kN/mm, typical of dimension series 18 (ultra-slim section for large shafts); use C0 2240 kN for static checks such as crane hook blocks standing under load. Fit practice for NCF18-530-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 650 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.",
      "The 990/2240 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-530-V?",
        "a": "SKF NCF 18/530 V is a single-row full-complement cylindrical roller bearing with 530 mm bore, 650 mm OD and 56 mm width per ISO 15. SKF lists C 990 kN, C0 2240 kN, Pu 180 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 38500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-530-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-530-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-530-V",
      "SKF NCF 18/530 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-560-V-HB1",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/560 V/HB1",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 560,
    "D_mm": 680,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1020,
    "static_load_kN": 2360,
    "fatigue_load_limit_kN": 186,
    "max_rpm": 430,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 430,
    "weight_g": 39000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 560 mm shaft, SKF lists NCF18-560-V-HB1 as single-row full-complement cylindrical roller: 680 mm OD, 56 mm wide, Pu 186 kN, the catalogue lists 340 r/min thermal reference speed and 430 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 60.0 mm and the catalogue mass 39000 g; at 1020 kN dynamic rating this is roughly 1.82 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 430 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 680 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1020/2360 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-560-V-HB1?",
        "a": "SKF NCF 18/560 V/HB1 is a single-row full-complement cylindrical roller bearing with 560 mm bore, 680 mm OD and 56 mm width per ISO 15. SKF lists C 1020 kN, C0 2360 kN, Pu 186 kN, reference speed 340 r/min and limiting speed 430 r/min, mass about 39000 g."
      },
      {
        "q": "What does the NCF designation and V/HB1 suffix mean?",
        "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-560-V-HB1 take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-560-V-HB1 compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-560-V-HB1",
      "SKF NCF 18/560 V/HB1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-600-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/600 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 600,
    "D_mm": 730,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1050,
    "static_load_kN": 2550,
    "fatigue_load_limit_kN": 196,
    "max_rpm": 400,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 400,
    "weight_g": 51500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 600 mm shaft, SKF lists NCF18-600-V as single-row full-complement cylindrical roller: 730 mm OD, 60 mm wide, Pu 196 kN, the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF18-600-V: the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. The mass entry 51500 g covers the complete catalogue execution. Fit practice for NCF18-600-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1050/2550 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-600-V?",
        "a": "SKF NCF 18/600 V is a single-row full-complement cylindrical roller bearing with 600 mm bore, 730 mm OD and 60 mm width per ISO 15. SKF lists C 1050 kN, C0 2550 kN, Pu 196 kN, reference speed 320 r/min and limiting speed 400 r/min, mass about 51500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-600-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-600-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-600-V",
      "SKF NCF 18/600 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-630-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/630 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 630,
    "D_mm": 780,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1250,
    "static_load_kN": 2900,
    "fatigue_load_limit_kN": 232,
    "max_rpm": 360,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 360,
    "weight_g": 72500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 18/630 V resolves to a 630×780×69 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.32 (2900 against 1250 kN), and the Pu figure 232 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 300 r/min thermal reference speed and 360 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 360 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.",
      "The 1250/2900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-630-V?",
        "a": "SKF NCF 18/630 V is a single-row full-complement cylindrical roller bearing with 630 mm bore, 780 mm OD and 69 mm width per ISO 15. SKF lists C 1250 kN, C0 2900 kN, Pu 232 kN, reference speed 300 r/min and limiting speed 360 r/min, mass about 72500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-630-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-630-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-630-V",
      "SKF NCF 18/630 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-670-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/670 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 670,
    "D_mm": 820,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1300,
    "static_load_kN": 3150,
    "fatigue_load_limit_kN": 245,
    "max_rpm": 340,
    "reference_speed_rpm": 280,
    "limiting_speed_rpm": 340,
    "weight_g": 74000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 18/670 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 670×820×69 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 74000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 670 mm seat is about 1.94 kN/mm, typical of dimension series 18 (ultra-slim section for large shafts); use C0 3150 kN for static checks such as crane hook blocks standing under load. Fit practice for NCF18-670-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 340 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.",
      "The 1300/3150 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-670-V?",
        "a": "SKF NCF 18/670 V is a single-row full-complement cylindrical roller bearing with 670 mm bore, 820 mm OD and 69 mm width per ISO 15. SKF lists C 1300 kN, C0 3150 kN, Pu 245 kN, reference speed 280 r/min and limiting speed 340 r/min, mass about 74000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-670-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-670-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-670-V",
      "SKF NCF 18/670 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-710-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/710 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 710,
    "D_mm": 870,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1540,
    "static_load_kN": 3750,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 320,
    "reference_speed_rpm": 260,
    "limiting_speed_rpm": 320,
    "weight_g": 92500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 18/710 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 710×870×74 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 92500 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 80.0 mm and the catalogue mass 92500 g; at 1540 kN dynamic rating this is roughly 2.17 kN of C per millimetre of bore before application factors. Fit practice for NCF18-710-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 320 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 870 mm raceway.",
      "The 1540/3750 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-710-V?",
        "a": "SKF NCF 18/710 V is a single-row full-complement cylindrical roller bearing with 710 mm bore, 870 mm OD and 74 mm width per ISO 15. SKF lists C 1540 kN, C0 3750 kN, Pu 285 kN, reference speed 260 r/min and limiting speed 320 r/min, mass about 92500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-710-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-710-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-710-V",
      "SKF NCF 18/710 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-750-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/750 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 750,
    "D_mm": 920,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1760,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 315,
    "max_rpm": 300,
    "reference_speed_rpm": 240,
    "limiting_speed_rpm": 300,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 18/750 V is a single-row full-complement cylindrical roller bearing sized 750×920×78 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.44 (4300 against 1760 kN), and the Pu figure 315 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 240 r/min thermal reference speed and 300 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 750 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 920 mm raceway.",
      "The 1760/4300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-750-V?",
        "a": "SKF NCF 18/750 V is a single-row full-complement cylindrical roller bearing with 750 mm bore, 920 mm OD and 78 mm width per ISO 15. SKF lists C 1760 kN, C0 4300 kN, Pu 315 kN, reference speed 240 r/min and limiting speed 300 r/min, mass about 105000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-750-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-750-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-750-V",
      "SKF NCF 18/750 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-800-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/800 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 800,
    "D_mm": 980,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1940,
    "static_load_kN": 4800,
    "fatigue_load_limit_kN": 345,
    "max_rpm": 280,
    "reference_speed_rpm": 220,
    "limiting_speed_rpm": 280,
    "weight_g": 126000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 18/800 V is a single-row full-complement cylindrical roller bearing sized 800×980×82 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.47 (4800 against 1940 kN), and the Pu figure 345 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 220 r/min thermal reference speed and 280 r/min mechanical limiting speed. Fit practice for NCF18-800-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 280 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 980 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1940/4800 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-800-V?",
        "a": "SKF NCF 18/800 V is a single-row full-complement cylindrical roller bearing with 800 mm bore, 980 mm OD and 82 mm width per ISO 15. SKF lists C 1940 kN, C0 4800 kN, Pu 345 kN, reference speed 220 r/min and limiting speed 280 r/min, mass about 126000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-800-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-800-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-800-V",
      "SKF NCF 18/800 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-850-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/850 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 850,
    "D_mm": 1030,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2050,
    "static_load_kN": 5200,
    "fatigue_load_limit_kN": 375,
    "max_rpm": 260,
    "reference_speed_rpm": 200,
    "limiting_speed_rpm": 260,
    "weight_g": 131000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 18/850 V is a single-row full-complement cylindrical roller bearing sized 850×1030×82 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 90.0 mm and the catalogue mass 131000 g; at 2050 kN dynamic rating this is roughly 2.41 kN of C per millimetre of bore before application factors. Fit practice for NCF18-850-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 260 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1030 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1030 mm raceway.",
      "The 2050/5200 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-850-V?",
        "a": "SKF NCF 18/850 V is a single-row full-complement cylindrical roller bearing with 850 mm bore, 1030 mm OD and 82 mm width per ISO 15. SKF lists C 2050 kN, C0 5200 kN, Pu 375 kN, reference speed 200 r/min and limiting speed 260 r/min, mass about 131000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-850-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-850-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-850-V",
      "SKF NCF 18/850 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-900-V-HB1",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/900 V/HB1",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 900,
    "D_mm": 1090,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2240,
    "static_load_kN": 5700,
    "fatigue_load_limit_kN": 405,
    "max_rpm": 240,
    "reference_speed_rpm": 190,
    "limiting_speed_rpm": 240,
    "weight_g": 154000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 900 mm shaft, SKF lists NCF18-900-V-HB1 as single-row full-complement cylindrical roller: 1090 mm OD, 85 mm wide, Pu 405 kN, the catalogue lists 190 r/min thermal reference speed and 240 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF18-900-V-HB1: the catalogue lists 190 r/min thermal reference speed and 240 r/min mechanical limiting speed. The mass entry 154000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 900 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 240 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1090 mm raceway.",
      "The 2240/5700 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-900-V-HB1?",
        "a": "SKF NCF 18/900 V/HB1 is a single-row full-complement cylindrical roller bearing with 900 mm bore, 1090 mm OD and 85 mm width per ISO 15. SKF lists C 2240 kN, C0 5700 kN, Pu 405 kN, reference speed 190 r/min and limiting speed 240 r/min, mass about 154000 g."
      },
      {
        "q": "What does the NCF designation and V/HB1 suffix mean?",
        "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-900-V-HB1 take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-900-V-HB1 compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-900-V-HB1",
      "SKF NCF 18/900 V/HB1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF18-950-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 18/950 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 950,
    "D_mm": 1150,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2420,
    "static_load_kN": 6300,
    "fatigue_load_limit_kN": 425,
    "max_rpm": 220,
    "reference_speed_rpm": 170,
    "limiting_speed_rpm": 220,
    "weight_g": 185000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 18/950 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 950×1150×90 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 185000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 2420 kN and C0 6300 kN, size the bearing on the 950×1150 mm ISO 15 envelope and check the 425 kN Pu against the equivalent-load floor; the catalogue lists 170 r/min thermal reference speed and 220 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 950 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 220 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 90 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1150 mm raceway.",
      "The 2420/6300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF18-950-V?",
        "a": "SKF NCF 18/950 V is a single-row full-complement cylindrical roller bearing with 950 mm bore, 1150 mm OD and 90 mm width per ISO 15. SKF lists C 2420 kN, C0 6300 kN, Pu 425 kN, reference speed 170 r/min and limiting speed 220 r/min, mass about 185000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF18-950-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF18-950-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF18-950-V",
      "SKF NCF 18/950 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1840-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1840 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 250,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 176,
    "static_load_kN": 335,
    "fatigue_load_limit_kN": 32.5,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 2600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 1840 V is a single-row full-complement cylindrical roller bearing sized 200×250×24 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.90 (335 against 176 kN), and the Pu figure 32.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Fit practice for NCF1840-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 176/335 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1840-V?",
        "a": "SKF NCF 1840 V is a single-row full-complement cylindrical roller bearing with 200 mm bore, 250 mm OD and 24 mm width per ISO 15. SKF lists C 176 kN, C0 335 kN, Pu 32.5 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 2600 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1840-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1840-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1840",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1840-V",
      "SKF NCF 1840 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1844-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1844 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 270,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 183,
    "static_load_kN": 365,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 1200,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1200,
    "weight_g": 2850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 1844 V resolves to a 220×270×24 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 183 kN and C0 365 kN, size the bearing on the 220×270 mm ISO 15 envelope and check the 34.5 kN Pu against the equivalent-load floor; the catalogue lists 1,000 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 183/365 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1844-V?",
        "a": "SKF NCF 1844 V is a single-row full-complement cylindrical roller bearing with 220 mm bore, 270 mm OD and 24 mm width per ISO 15. SKF lists C 183 kN, C0 365 kN, Pu 34.5 kN, reference speed 1,000 r/min and limiting speed 1,200 r/min, mass about 2850 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1844-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1844-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1844",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1844-V",
      "SKF NCF 1844 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1848-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1848 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 300,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 260,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 47.5,
    "max_rpm": 1100,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1100,
    "weight_g": 4400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 1848 V is a single-row full-complement cylindrical roller bearing sized 240×300×28 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.96 (510 against 260 kN), and the Pu figure 47.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 900 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Fit practice for NCF1848-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 28 mm-wide ring and concentrates load.",
      "The 260/510 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1848-V?",
        "a": "SKF NCF 1848 V is a single-row full-complement cylindrical roller bearing with 240 mm bore, 300 mm OD and 28 mm width per ISO 15. SKF lists C 260 kN, C0 510 kN, Pu 47.5 kN, reference speed 900 r/min and limiting speed 1,100 r/min, mass about 4400 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1848-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1848-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1848",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1848-V",
      "SKF NCF 1848 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1852-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1852 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 320,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 270,
    "static_load_kN": 550,
    "fatigue_load_limit_kN": 50,
    "max_rpm": 1000,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1000,
    "weight_g": 4550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 1852 V resolves to a 260×320×28 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 30.0 mm and the catalogue mass 4550 g; at 270 kN dynamic rating this is roughly 1.04 kN of C per millimetre of bore before application factors. Fit practice for NCF1852-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 28 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 270/550 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1852-V?",
        "a": "SKF NCF 1852 V is a single-row full-complement cylindrical roller bearing with 260 mm bore, 320 mm OD and 28 mm width per ISO 15. SKF lists C 270 kN, C0 550 kN, Pu 50 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 4550 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1852-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1852-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1852",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1852-V",
      "SKF NCF 1852 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1856-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1856 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 350,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 341,
    "static_load_kN": 695,
    "fatigue_load_limit_kN": 64,
    "max_rpm": 950,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 950,
    "weight_g": 7100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 1856 V is a single-row full-complement cylindrical roller bearing sized 280×350×33 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF1856-V: the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. The mass entry 7100 g covers the complete catalogue execution. Fit practice for NCF1856-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 950 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 33 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 341/695 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1856-V?",
        "a": "SKF NCF 1856 V is a single-row full-complement cylindrical roller bearing with 280 mm bore, 350 mm OD and 33 mm width per ISO 15. SKF lists C 341 kN, C0 695 kN, Pu 64 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 7100 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1856-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1856-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1856",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1856-V",
      "SKF NCF 1856 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1860-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1860 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 380,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 418,
    "static_load_kN": 850,
    "fatigue_load_limit_kN": 75,
    "max_rpm": 850,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 850,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 1860 V resolves to a 300×380×38 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.03 (850 against 418 kN), and the Pu figure 75 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 670 r/min thermal reference speed and 850 r/min mechanical limiting speed. Fit practice for NCF1860-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 850 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.",
      "The 418/850 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1860-V?",
        "a": "SKF NCF 1860 V is a single-row full-complement cylindrical roller bearing with 300 mm bore, 380 mm OD and 38 mm width per ISO 15. SKF lists C 418 kN, C0 850 kN, Pu 75 kN, reference speed 670 r/min and limiting speed 850 r/min, mass about 10000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1860-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1860-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1860",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1860-V",
      "SKF NCF 1860 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1864-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1864 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 400,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 440,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 80,
    "max_rpm": 800,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 800,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 320 mm shaft, SKF lists NCF1864-V as single-row full-complement cylindrical roller: 400 mm OD, 38 mm wide, Pu 80 kN, the catalogue lists 630 r/min thermal reference speed and 800 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 440 kN and C0 900 kN, size the bearing on the 320×400 mm ISO 15 envelope and check the 80 kN Pu against the equivalent-load floor; the catalogue lists 630 r/min thermal reference speed and 800 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 320 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.",
      "The 440/900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1864-V?",
        "a": "SKF NCF 1864 V is a single-row full-complement cylindrical roller bearing with 320 mm bore, 400 mm OD and 38 mm width per ISO 15. SKF lists C 440 kN, C0 900 kN, Pu 80 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 10500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1864-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1864-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1864",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1864-V",
      "SKF NCF 1864 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1868-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1868 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 420,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 446,
    "static_load_kN": 950,
    "fatigue_load_limit_kN": 83,
    "max_rpm": 750,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 750,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 1868 V resolves to a 340×420×38 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 340 mm seat is about 1.31 kN/mm, typical of dimension series 18 (ultra-slim section for large shafts); use C0 950 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 340 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 750 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "The 446/950 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1868-V?",
        "a": "SKF NCF 1868 V is a single-row full-complement cylindrical roller bearing with 340 mm bore, 420 mm OD and 38 mm width per ISO 15. SKF lists C 446 kN, C0 950 kN, Pu 83 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 11000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1868-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1868-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1868",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1868-V",
      "SKF NCF 1868 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1872-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1872 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 440,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 402,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 76.5,
    "max_rpm": 700,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 700,
    "weight_g": 11500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 360 mm shaft, SKF lists NCF1872-V as single-row full-complement cylindrical roller: 440 mm OD, 38 mm wide, Pu 76.5 kN, the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 40.0 mm and the catalogue mass 11500 g; at 402 kN dynamic rating this is roughly 1.12 kN of C per millimetre of bore before application factors. Fit practice for NCF1872-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 38 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.",
      "The 402/900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1872-V?",
        "a": "SKF NCF 1872 V is a single-row full-complement cylindrical roller bearing with 360 mm bore, 440 mm OD and 38 mm width per ISO 15. SKF lists C 402 kN, C0 900 kN, Pu 76.5 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 11500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1872-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1872-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1872",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1872-V",
      "SKF NCF 1872 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1876-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1876 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 480,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 627,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 670,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 670,
    "weight_g": 19500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 1876 V resolves to a 380×480×46 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF1876-V: the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. The mass entry 19500 g covers the complete catalogue execution. Fit practice for NCF1876-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 670 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.",
      "The 627/1290 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1876-V?",
        "a": "SKF NCF 1876 V is a single-row full-complement cylindrical roller bearing with 380 mm bore, 480 mm OD and 46 mm width per ISO 15. SKF lists C 627 kN, C0 1290 kN, Pu 114 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 19500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1876-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1876-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1876",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1876-V",
      "SKF NCF 1876 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1880-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1880 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 500,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 627,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 118,
    "max_rpm": 630,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 630,
    "weight_g": 20500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 400 mm shaft, SKF lists NCF1880-V as single-row full-complement cylindrical roller: 500 mm OD, 46 mm wide, Pu 118 kN, the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.14 (1340 against 627 kN), and the Pu figure 118 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Fit practice for NCF1880-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 630 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.",
      "The 627/1340 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1880-V?",
        "a": "SKF NCF 1880 V is a single-row full-complement cylindrical roller bearing with 400 mm bore, 500 mm OD and 46 mm width per ISO 15. SKF lists C 627 kN, C0 1340 kN, Pu 118 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 20500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1880-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1880-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1880",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1880-V",
      "SKF NCF 1880 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1884-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1884 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 520,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 660,
    "static_load_kN": 1430,
    "fatigue_load_limit_kN": 122,
    "max_rpm": 600,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 600,
    "weight_g": 20500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 1884 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 420×520×46 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 20500 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 660 kN and C0 1430 kN, size the bearing on the 420×520 mm ISO 15 envelope and check the 122 kN Pu against the equivalent-load floor; the catalogue lists 480 r/min thermal reference speed and 600 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 420 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 520 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.",
      "The 660/1430 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1884-V?",
        "a": "SKF NCF 1884 V is a single-row full-complement cylindrical roller bearing with 420 mm bore, 520 mm OD and 46 mm width per ISO 15. SKF lists C 660 kN, C0 1430 kN, Pu 122 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 20500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1884-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1884-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1884",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1884-V",
      "SKF NCF 1884 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1888-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1888 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 540,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 671,
    "static_load_kN": 1460,
    "fatigue_load_limit_kN": 125,
    "max_rpm": 560,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 560,
    "weight_g": 22000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 440 mm shaft, SKF lists NCF1888-V as single-row full-complement cylindrical roller: 540 mm OD, 46 mm wide, Pu 125 kN, the catalogue lists 450 r/min thermal reference speed and 560 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 440 mm seat is about 1.52 kN/mm, typical of dimension series 18 (ultra-slim section for large shafts); use C0 1460 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 440 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 560 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.",
      "The 671/1460 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1888-V?",
        "a": "SKF NCF 1888 V is a single-row full-complement cylindrical roller bearing with 440 mm bore, 540 mm OD and 46 mm width per ISO 15. SKF lists C 671 kN, C0 1460 kN, Pu 125 kN, reference speed 450 r/min and limiting speed 560 r/min, mass about 22000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1888-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1888-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1888",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1888-V",
      "SKF NCF 1888 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF1896-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 1896 V",
    "series": "NCF1800-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 600,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 935,
    "static_load_kN": 2040,
    "fatigue_load_limit_kN": 170,
    "max_rpm": 500,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 500,
    "weight_g": 35500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 480 mm shaft, SKF lists NCF1896-V as single-row full-complement cylindrical roller: 600 mm OD, 56 mm wide, Pu 170 kN, the catalogue lists 400 r/min thermal reference speed and 500 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 935 kN and C0 2040 kN, size the bearing on the 480×600 mm ISO 15 envelope and check the 170 kN Pu against the equivalent-load floor; the catalogue lists 400 r/min thermal reference speed and 500 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 480 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 935/2040 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF1896-V?",
        "a": "SKF NCF 1896 V is a single-row full-complement cylindrical roller bearing with 480 mm bore, 600 mm OD and 56 mm width per ISO 15. SKF lists C 935 kN, C0 2040 kN, Pu 170 kN, reference speed 400 r/min and limiting speed 500 r/min, mass about 35500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF1896-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF1896-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF1896",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF1896-V",
      "SKF NCF 1896 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2224-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2224 V",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 512,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 85,
    "max_rpm": 1700,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1700,
    "weight_g": 9050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2224 V is a single-row full-complement cylindrical roller bearing sized 120×215×58 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 512 kN and C0 735 kN, size the bearing on the 120×215 mm ISO 15 envelope and check the 85 kN Pu against the equivalent-load floor; the catalogue lists 1,400 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 512/735 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2224-V?",
        "a": "SKF NCF 2224 V is a single-row full-complement cylindrical roller bearing with 120 mm bore, 215 mm OD and 58 mm width per ISO 15. SKF lists C 512 kN, C0 735 kN, Pu 85 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 9050 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2224-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2224-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2224",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2224-V",
      "SKF NCF 2224 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2228-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2228 ECJB",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 680,
    "static_load_kN": 880,
    "fatigue_load_limit_kN": 96.5,
    "max_rpm": 3600,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3600,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2228-ECJB is the 140 mm bore entry in the NCF2200 range: a 140×250×68 mm high-capacity cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 680 kN / C0 880 kN. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Speed planning for NCF2228-ECJB: the catalogue lists 2,800 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 14500 g covers the complete catalogue execution. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2228 using the /PEX loads.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 68 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 68 mm-wide ring and concentrates load.",
      "The 680/880 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2228-ECJB?",
        "a": "SKF NCF 2228 ECJB is a high-capacity cylindrical roller bearing with 140 mm bore, 250 mm OD and 68 mm width per ISO 15. SKF lists C 680 kN, C0 880 kN, Pu 96.5 kN, reference speed 2,800 r/min and limiting speed 3,600 r/min, mass about 14500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2228-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2228-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2228-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×250×68 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2228-ECJB",
      "SKF NCF 2228 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2228-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2228 V",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 693,
    "static_load_kN": 1020,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 1500,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1500,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2228-V is the 140 mm bore entry in the NCF2200 range: a 140×250×68 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 693 kN / C0 1020 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 140 mm seat is about 4.95 kN/mm, typical of dimension series 22 (light-section, wide); use C0 1020 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 140 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 693/1020 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2228-V?",
        "a": "SKF NCF 2228 V is a single-row full-complement cylindrical roller bearing with 140 mm bore, 250 mm OD and 68 mm width per ISO 15. SKF lists C 693 kN, C0 1020 kN, Pu 114 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 14500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2228-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2228-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2228",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2228-V",
      "SKF NCF 2228 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2230-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2230 ECJB",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 780,
    "static_load_kN": 1040,
    "fatigue_load_limit_kN": 112,
    "max_rpm": 3400,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3400,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2230-ECJB is the 150 mm bore entry in the NCF2200 range: a 150×270×73 mm high-capacity cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 780 kN / C0 1040 kN. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Speed planning for NCF2230-ECJB: the catalogue lists 2,600 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The mass entry 18000 g covers the complete catalogue execution. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2230 using the /PEX loads.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 73 mm-wide ring and concentrates load.",
      "The 780/1040 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2230-ECJB?",
        "a": "SKF NCF 2230 ECJB is a high-capacity cylindrical roller bearing with 150 mm bore, 270 mm OD and 73 mm width per ISO 15. SKF lists C 780 kN, C0 1040 kN, Pu 112 kN, reference speed 2,600 r/min and limiting speed 3,400 r/min, mass about 18000 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2230-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2230-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2230-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×270×73 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2230-ECJB",
      "SKF NCF 2230 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2230-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2230 V",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 781,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 132,
    "max_rpm": 1200,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1200,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 150 mm shaft, SKF lists NCF2230-V as single-row full-complement cylindrical roller: 270 mm OD, 73 mm wide, Pu 132 kN, the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2230-V: the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The mass entry 18500 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 150 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 781/1220 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2230-V?",
        "a": "SKF NCF 2230 V is a single-row full-complement cylindrical roller bearing with 150 mm bore, 270 mm OD and 73 mm width per ISO 15. SKF lists C 781 kN, C0 1220 kN, Pu 132 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 18500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2230-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2230-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2230",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2230-V",
      "SKF NCF 2230 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2232-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2232 ECJB",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 980,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 134,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 23500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2232 ECJB is a high-capacity cylindrical roller bearing sized 160×290×80 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.2. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Selection arithmetic: C0/C ≈ 1.30 (1270 against 980 kN), and the Pu figure 134 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2232 using the /PEX loads.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "The 980/1270 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2232-ECJB?",
        "a": "SKF NCF 2232 ECJB is a high-capacity cylindrical roller bearing with 160 mm bore, 290 mm OD and 80 mm width per ISO 15. SKF lists C 980 kN, C0 1270 kN, Pu 134 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 23500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2232-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2232-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2232-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×290×80 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2232-ECJB",
      "SKF NCF 2232 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2232-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2232 V",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 990,
    "static_load_kN": 1500,
    "fatigue_load_limit_kN": 160,
    "max_rpm": 1200,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1200,
    "weight_g": 23000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2232 V is a single-row full-complement cylindrical roller bearing sized 160×290×80 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 65.0 mm and the catalogue mass 23000 g; at 990 kN dynamic rating this is roughly 6.19 kN of C per millimetre of bore before application factors. Fit practice for NCF2232-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 990/1500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2232-V?",
        "a": "SKF NCF 2232 V is a single-row full-complement cylindrical roller bearing with 160 mm bore, 290 mm OD and 80 mm width per ISO 15. SKF lists C 990 kN, C0 1500 kN, Pu 160 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 23000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2232-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2232-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2232-V",
      "SKF NCF 2232 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2234-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2234 ECJB",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1160,
    "static_load_kN": 1530,
    "fatigue_load_limit_kN": 156,
    "max_rpm": 2800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2800,
    "weight_g": 28000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2234 ECJB resolves to a 170×310×86 mm high-capacity cylindrical roller bearing (dimension series 22 (light-section, wide)); the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). With C 1160 kN and C0 1530 kN, size the bearing on the 170×310 mm ISO 15 envelope and check the 156 kN Pu against the equivalent-load floor; the catalogue lists 2,200 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2234 using the /PEX loads.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 86 mm-wide ring and concentrates load.",
      "The 1160/1530 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2234-ECJB?",
        "a": "SKF NCF 2234 ECJB is a high-capacity cylindrical roller bearing with 170 mm bore, 310 mm OD and 86 mm width per ISO 15. SKF lists C 1160 kN, C0 1530 kN, Pu 156 kN, reference speed 2,200 r/min and limiting speed 2,800 r/min, mass about 28000 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2234-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2234-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2234-ECMH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 170×310×86 mm, but catalogue C/C0 ratings differ between executions (1160/1530 vs 1600/1530 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2234-ECJB",
      "SKF NCF 2234 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2234-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2234 V",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1100,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 176,
    "max_rpm": 1100,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1100,
    "weight_g": 28500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2234 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 170×310×86 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 28500 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.55 (1700 against 1100 kN), and the Pu figure 176 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 900 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 310 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1100/1700 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2234-V?",
        "a": "SKF NCF 2234 V is a single-row full-complement cylindrical roller bearing with 170 mm bore, 310 mm OD and 86 mm width per ISO 15. SKF lists C 1100 kN, C0 1700 kN, Pu 176 kN, reference speed 900 r/min and limiting speed 1,100 r/min, mass about 28500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2234-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2234-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2234-V",
      "SKF NCF 2234 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2236-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2236 ECJB",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1200,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 166,
    "max_rpm": 2800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2800,
    "weight_g": 30000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2236 ECJB is a high-capacity cylindrical roller bearing sized 180×320×86 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.2. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Speed planning for NCF2236-ECJB: the catalogue lists 2,200 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. The mass entry 30000 g covers the complete catalogue execution. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2236 using the /PEX loads.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1200/1600 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2236-ECJB?",
        "a": "SKF NCF 2236 ECJB is a high-capacity cylindrical roller bearing with 180 mm bore, 320 mm OD and 86 mm width per ISO 15. SKF lists C 1200 kN, C0 1600 kN, Pu 166 kN, reference speed 2,200 r/min and limiting speed 2,800 r/min, mass about 30000 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2236-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2236-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2236-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×320×86 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2236-ECJB",
      "SKF NCF 2236 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2238-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2238 ECJB",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 180,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 36500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2238 ECJB resolves to a 190×340×92 mm high-capacity cylindrical roller bearing (dimension series 22 (light-section, wide)); the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Selection arithmetic: C0/C ≈ 1.33 (1760 against 1320 kN), and the Pu figure 180 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 2,600 r/min mechanical limiting speed. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2238 using the /PEX loads.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 92 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1320/1760 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2238-ECJB?",
        "a": "SKF NCF 2238 ECJB is a high-capacity cylindrical roller bearing with 190 mm bore, 340 mm OD and 92 mm width per ISO 15. SKF lists C 1320 kN, C0 1760 kN, Pu 180 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 36500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2238-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2238-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2238-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×340×92 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2238-ECJB",
      "SKF NCF 2238 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2238-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2238 V",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1250,
    "static_load_kN": 1900,
    "fatigue_load_limit_kN": 196,
    "max_rpm": 1000,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1000,
    "weight_g": 35500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 190 mm shaft, SKF lists NCF2238-V as single-row full-complement cylindrical roller: 340 mm OD, 92 mm wide, Pu 196 kN, the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 75.0 mm and the catalogue mass 35500 g; at 1250 kN dynamic rating this is roughly 6.58 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1250/1900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2238-V?",
        "a": "SKF NCF 2238 V is a single-row full-complement cylindrical roller bearing with 190 mm bore, 340 mm OD and 92 mm width per ISO 15. SKF lists C 1250 kN, C0 1900 kN, Pu 196 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 35500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2238-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2238-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2238-V",
      "SKF NCF 2238 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2240-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2240 ECJB",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1460,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 200,
    "max_rpm": 2400,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2400,
    "weight_g": 43000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2240 ECJB denotes a high-capacity cylindrical roller bearing on the ISO 15 200×360×98 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 43000 g. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.37 (2000 against 1460 kN), and the Pu figure 200 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Fit practice for NCF2240-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2240 using the /PEX loads.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1460/2000 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2240-ECJB?",
        "a": "SKF NCF 2240 ECJB is a high-capacity cylindrical roller bearing with 200 mm bore, 360 mm OD and 98 mm width per ISO 15. SKF lists C 1460 kN, C0 2000 kN, Pu 200 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 43000 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2240-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2240-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2240-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×360×98 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2240-ECJB",
      "SKF NCF 2240 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2244-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2244 ECJB",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1760,
    "static_load_kN": 2600,
    "fatigue_load_limit_kN": 240,
    "max_rpm": 2200,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2200,
    "weight_g": 58500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2244 ECJB denotes a high-capacity cylindrical roller bearing on the ISO 15 220×400×108 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 58500 g. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Speed planning for NCF2244-ECJB: the catalogue lists 1,600 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. The mass entry 58500 g covers the complete catalogue execution. Fit practice for NCF2244-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2244 using the /PEX loads.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.",
      "The 1760/2600 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2244-ECJB?",
        "a": "SKF NCF 2244 ECJB is a high-capacity cylindrical roller bearing with 220 mm bore, 400 mm OD and 108 mm width per ISO 15. SKF lists C 1760 kN, C0 2600 kN, Pu 240 kN, reference speed 1,600 r/min and limiting speed 2,200 r/min, mass about 58500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2244-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2244-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2244-ECJB-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 220×400×108 mm, but catalogue C/C0 ratings differ between executions (1760/2600 vs 2000/2600 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2244-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×400×108 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUH2244-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 220×400×108 mm, but catalogue C/C0 ratings differ between executions (1760/2600 vs 2000/2600 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2244-ECJB",
      "SKF NCF 2244 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2244-ECJB-PEX",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2244 ECJB/PEX",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2000,
    "static_load_kN": 2600,
    "fatigue_load_limit_kN": 240,
    "max_rpm": 2200,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2200,
    "weight_g": 58500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 220 mm shaft, SKF lists NCF2244-ECJB-PEX as high-capacity cylindrical roller: 400 mm OD, 108 mm wide, Pu 240 kN, the catalogue lists 1,700 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. The radial section height is 90.0 mm and the catalogue mass 58500 g; at 2000 kN dynamic rating this is roughly 9.09 kN of C per millimetre of bore before application factors. Fit practice for NCF2244-ECJB-PEX: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 2000 kN / C0 2600 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2244-ECJB-PEX as a separate service part: do not substitute the standard NCF 2244 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.",
    "applications": [
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion build and the standard NCF 2244 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 2000/2600 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2244-ECJB-PEX?",
        "a": "SKF NCF 2244 ECJB/PEX is a high-capacity cylindrical roller bearing with 220 mm bore, 400 mm OD and 108 mm width per ISO 15. SKF lists C 2000 kN, C0 2600 kN, Pu 240 kN, reference speed 1,700 r/min and limiting speed 2,200 r/min, mass about 58500 g."
      },
      {
        "q": "What does the NCF designation and ECJB/PEX suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2244-ECJB-PEX take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2244-ECJB-PEX compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2244-ECJB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 220×400×108 mm, but catalogue C/C0 ratings differ between executions (2000/2600 vs 1760/2600 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2244-ECMH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 220×400×108 mm, but catalogue C/C0 ratings differ between executions (2000/2600 vs 1760/2600 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2244-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×400×108 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2244-ECJB-PEX",
      "SKF NCF 2244 ECJB/PEX"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2244-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2244 V",
    "series": "NCF2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1830,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 255,
    "max_rpm": 850,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 850,
    "weight_g": 58000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2244 V resolves to a 220×400×108 mm single-row full-complement cylindrical roller bearing (dimension series 22 (light-section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 90.0 mm and the catalogue mass 58000 g; at 1830 kN dynamic rating this is roughly 8.32 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 850 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.",
      "The 1830/2750 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2244-V?",
        "a": "SKF NCF 2244 V is a single-row full-complement cylindrical roller bearing with 220 mm bore, 400 mm OD and 108 mm width per ISO 15. SKF lists C 1830 kN, C0 2750 kN, Pu 255 kN, reference speed 700 r/min and limiting speed 850 r/min, mass about 58000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2244-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2244-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2244-V",
      "SKF NCF 2244 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2326-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2326 ECJB",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1120,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 146,
    "max_rpm": 3400,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3400,
    "weight_g": 29000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 130 mm shaft, SKF lists NCF2326-ECJB as high-capacity cylindrical roller: 280 mm OD, 93 mm wide, Pu 146 kN, the catalogue lists 2,400 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The radial section height is 75.0 mm and the catalogue mass 29000 g; at 1120 kN dynamic rating this is roughly 8.62 kN of C per millimetre of bore before application factors. Fit practice for NCF2326-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2326 using the /PEX loads.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 93 mm-wide ring and concentrates load.",
      "The 1120/1340 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2326-ECJB?",
        "a": "SKF NCF 2326 ECJB is a high-capacity cylindrical roller bearing with 130 mm bore, 280 mm OD and 93 mm width per ISO 15. SKF lists C 1120 kN, C0 1340 kN, Pu 146 kN, reference speed 2,400 r/min and limiting speed 3,400 r/min, mass about 29000 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2326-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2326-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2326-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×280×93 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2326-ECJB",
      "SKF NCF 2326 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2328-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2328 ECJB",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1250,
    "static_load_kN": 1530,
    "fatigue_load_limit_kN": 163,
    "max_rpm": 3200,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3200,
    "weight_g": 35500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2328 ECJB denotes a high-capacity cylindrical roller bearing on the ISO 15 140×300×102 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 35500 g. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Speed planning for NCF2328-ECJB: the catalogue lists 2,400 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. The mass entry 35500 g covers the complete catalogue execution. Fit practice for NCF2328-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2328 using the /PEX loads.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 102 mm-wide ring and concentrates load.",
      "The 1250/1530 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2328-ECJB?",
        "a": "SKF NCF 2328 ECJB is a high-capacity cylindrical roller bearing with 140 mm bore, 300 mm OD and 102 mm width per ISO 15. SKF lists C 1250 kN, C0 1530 kN, Pu 163 kN, reference speed 2,400 r/min and limiting speed 3,200 r/min, mass about 35500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2328-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2328-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2328-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×300×102 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2328-ECJB",
      "SKF NCF 2328 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2330-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2330 ECJB",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1430,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 183,
    "max_rpm": 3000,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3000,
    "weight_g": 43500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2330 ECJB denotes a high-capacity cylindrical roller bearing on the ISO 15 150×320×108 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 43500 g. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Speed planning for NCF2330-ECJB: the catalogue lists 2,200 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The mass entry 43500 g covers the complete catalogue execution. Fit practice for NCF2330-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2330 using the /PEX loads.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 108 mm-wide ring and concentrates load.",
      "The 1430/1760 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2330-ECJB?",
        "a": "SKF NCF 2330 ECJB is a high-capacity cylindrical roller bearing with 150 mm bore, 320 mm OD and 108 mm width per ISO 15. SKF lists C 1430 kN, C0 1760 kN, Pu 183 kN, reference speed 2,200 r/min and limiting speed 3,000 r/min, mass about 43500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2330-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2330-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2330-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×320×108 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2330-ECJB",
      "SKF NCF 2330 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2332-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2332 ECJB",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1400,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 196,
    "max_rpm": 2800,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2800,
    "weight_g": 50500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2332-ECJB is the 160 mm bore entry in the NCF2300 range: a 160×340×114 mm high-capacity cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 1400 kN / C0 2000 kN. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Load-per-bore for the 160 mm seat is about 8.75 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 2000 kN for static checks such as crane hook blocks standing under load. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2332 using the /PEX loads.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1400/2000 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2332-ECJB?",
        "a": "SKF NCF 2332 ECJB is a high-capacity cylindrical roller bearing with 160 mm bore, 340 mm OD and 114 mm width per ISO 15. SKF lists C 1400 kN, C0 2000 kN, Pu 196 kN, reference speed 1,800 r/min and limiting speed 2,800 r/min, mass about 50500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2332-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2332-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2332-ECJB-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 160×340×114 mm, but catalogue C/C0 ratings differ between executions (1400/2000 vs 1600/2000 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2332-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×340×114 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUH2332-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 160×340×114 mm, but catalogue C/C0 ratings differ between executions (1400/2000 vs 1600/2000 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2332-ECJB",
      "SKF NCF 2332 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2332-ECJB-PEX",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2332 ECJB/PEX",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1600,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 196,
    "max_rpm": 2800,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2800,
    "weight_g": 50500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 160 mm shaft, SKF lists NCF2332-ECJB-PEX as high-capacity cylindrical roller: 340 mm OD, 114 mm wide, Pu 196 kN, the catalogue lists 2,000 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Selection arithmetic: C0/C ≈ 1.25 (2000 against 1600 kN), and the Pu figure 196 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 1600 kN / C0 2000 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2332-ECJB-PEX as a separate service part: do not substitute the standard NCF 2332 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion build and the standard NCF 2332 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 114 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1600/2000 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2332-ECJB-PEX?",
        "a": "SKF NCF 2332 ECJB/PEX is a high-capacity cylindrical roller bearing with 160 mm bore, 340 mm OD and 114 mm width per ISO 15. SKF lists C 1600 kN, C0 2000 kN, Pu 196 kN, reference speed 2,000 r/min and limiting speed 2,800 r/min, mass about 50500 g."
      },
      {
        "q": "What does the NCF designation and ECJB/PEX suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2332-ECJB-PEX take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2332-ECJB-PEX compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2332-ECJB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 160×340×114 mm, but catalogue C/C0 ratings differ between executions (1600/2000 vs 1400/2000 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2332-ECMH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 160×340×114 mm, but catalogue C/C0 ratings differ between executions (1600/2000 vs 1400/2000 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2332-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×340×114 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2332-ECJB-PEX",
      "SKF NCF 2332 ECJB/PEX"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2334-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2334 ECJB",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1540,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 216,
    "max_rpm": 2600,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2600,
    "weight_g": 58500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2334 ECJB is a high-capacity cylindrical roller bearing sized 170×360×120 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.2. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). The radial section height is 95.0 mm and the catalogue mass 58500 g; at 1540 kN dynamic rating this is roughly 9.06 kN of C per millimetre of bore before application factors. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2334 using the /PEX loads.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 120 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1540/2200 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2334-ECJB?",
        "a": "SKF NCF 2334 ECJB is a high-capacity cylindrical roller bearing with 170 mm bore, 360 mm OD and 120 mm width per ISO 15. SKF lists C 1540 kN, C0 2200 kN, Pu 216 kN, reference speed 1,700 r/min and limiting speed 2,600 r/min, mass about 58500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2334-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2334-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2334-ECJB-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 170×360×120 mm, but catalogue C/C0 ratings differ between executions (1540/2200 vs 1760/2200 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2334-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×360×120 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUH2334-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 170×360×120 mm, but catalogue C/C0 ratings differ between executions (1540/2200 vs 1760/2200 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2334-ECJB",
      "SKF NCF 2334 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2334-ECJB-PEX",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2334 ECJB/PEX",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1760,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 216,
    "max_rpm": 2600,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2600,
    "weight_g": 58500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2334 ECJB/PEX denotes a high-capacity cylindrical roller bearing on the ISO 15 170×360×120 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 58500 g. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The radial section height is 95.0 mm and the catalogue mass 58500 g; at 1760 kN dynamic rating this is roughly 10.35 kN of C per millimetre of bore before application factors. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 1760 kN / C0 2200 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2334-ECJB-PEX as a separate service part: do not substitute the standard NCF 2334 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion build and the standard NCF 2334 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 120 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1760/2200 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2334-ECJB-PEX?",
        "a": "SKF NCF 2334 ECJB/PEX is a high-capacity cylindrical roller bearing with 170 mm bore, 360 mm OD and 120 mm width per ISO 15. SKF lists C 1760 kN, C0 2200 kN, Pu 216 kN, reference speed 1,900 r/min and limiting speed 2,600 r/min, mass about 58500 g."
      },
      {
        "q": "What does the NCF designation and ECJB/PEX suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2334-ECJB-PEX take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2334-ECJB-PEX compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2334-ECJB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 170×360×120 mm, but catalogue C/C0 ratings differ between executions (1760/2200 vs 1540/2200 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2334-ECMH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 170×360×120 mm, but catalogue C/C0 ratings differ between executions (1760/2200 vs 1540/2200 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2334-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×360×120 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2334-ECJB-PEX",
      "SKF NCF 2334 ECJB/PEX"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2336-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2336 ECJB",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1720,
    "static_load_kN": 2400,
    "fatigue_load_limit_kN": 232,
    "max_rpm": 2400,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2400,
    "weight_g": 67500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2336-ECJB is the 180 mm bore entry in the NCF2300 range: a 180×380×126 mm high-capacity cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 1720 kN / C0 2400 kN. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NCF2336-ECJB: the catalogue lists 1,600 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. The mass entry 67500 g covers the complete catalogue execution. Fit practice for NCF2336-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2336 using the /PEX loads.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1720/2400 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2336-ECJB?",
        "a": "SKF NCF 2336 ECJB is a high-capacity cylindrical roller bearing with 180 mm bore, 380 mm OD and 126 mm width per ISO 15. SKF lists C 1720 kN, C0 2400 kN, Pu 232 kN, reference speed 1,600 r/min and limiting speed 2,400 r/min, mass about 67500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2336-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2336-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2336-ECJB-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 180×380×126 mm, but catalogue C/C0 ratings differ between executions (1720/2400 vs 1960/2400 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2336-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×380×126 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUH2336-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 180×380×126 mm, but catalogue C/C0 ratings differ between executions (1720/2400 vs 1960/2400 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2336-ECJB",
      "SKF NCF 2336 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2336-ECJB-PEX",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2336 ECJB/PEX",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1960,
    "static_load_kN": 2400,
    "fatigue_load_limit_kN": 232,
    "max_rpm": 2400,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2400,
    "weight_g": 67500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 180 mm shaft, SKF lists NCF2336-ECJB-PEX as high-capacity cylindrical roller: 380 mm OD, 126 mm wide, Pu 232 kN, the catalogue lists 1,800 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB/PEX: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). With C 1960 kN and C0 2400 kN, size the bearing on the 180×380 mm ISO 15 envelope and check the 232 kN Pu against the equivalent-load floor; the catalogue lists 1,800 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 1960 kN / C0 2400 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2336-ECJB-PEX as a separate service part: do not substitute the standard NCF 2336 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion build and the standard NCF 2336 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 126 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1960/2400 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2336-ECJB-PEX?",
        "a": "SKF NCF 2336 ECJB/PEX is a high-capacity cylindrical roller bearing with 180 mm bore, 380 mm OD and 126 mm width per ISO 15. SKF lists C 1960 kN, C0 2400 kN, Pu 232 kN, reference speed 1,800 r/min and limiting speed 2,400 r/min, mass about 67500 g."
      },
      {
        "q": "What does the NCF designation and ECJB/PEX suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2336-ECJB-PEX take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2336-ECJB-PEX compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2336-ECJB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 180×380×126 mm, but catalogue C/C0 ratings differ between executions (1960/2400 vs 1720/2400 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2336-ECMH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 180×380×126 mm, but catalogue C/C0 ratings differ between executions (1960/2400 vs 1720/2400 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2336-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×380×126 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2336-ECJB-PEX",
      "SKF NCF 2336 ECJB/PEX"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2338-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2338 ECJB",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1940,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 255,
    "max_rpm": 2200,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2200,
    "weight_g": 78000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2338 ECJB is a high-capacity cylindrical roller bearing sized 190×400×132 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.2. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Load-per-bore for the 190 mm seat is about 10.21 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 2750 kN for static checks such as crane hook blocks standing under load. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2338 using the /PEX loads.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.",
      "The 1940/2750 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2338-ECJB?",
        "a": "SKF NCF 2338 ECJB is a high-capacity cylindrical roller bearing with 190 mm bore, 400 mm OD and 132 mm width per ISO 15. SKF lists C 1940 kN, C0 2750 kN, Pu 255 kN, reference speed 1,500 r/min and limiting speed 2,200 r/min, mass about 78000 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2338-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2338-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2338-ECJB-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 190×400×132 mm, but catalogue C/C0 ratings differ between executions (1940/2750 vs 2240/2750 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2338-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×400×132 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUH2338-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 190×400×132 mm, but catalogue C/C0 ratings differ between executions (1940/2750 vs 2240/2750 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2338-ECJB",
      "SKF NCF 2338 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2338-ECJB-PEX",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2338 ECJB/PEX",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2240,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 255,
    "max_rpm": 2200,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2200,
    "weight_g": 78000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2338 ECJB/PEX denotes a high-capacity cylindrical roller bearing on the ISO 15 190×400×132 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 78000 g. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB/PEX: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). With C 2240 kN and C0 2750 kN, size the bearing on the 190×400 mm ISO 15 envelope and check the 255 kN Pu against the equivalent-load floor; the catalogue lists 1,700 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 2240 kN / C0 2750 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2338-ECJB-PEX as a separate service part: do not substitute the standard NCF 2338 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.",
    "applications": [
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion build and the standard NCF 2338 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 2240/2750 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2338-ECJB-PEX?",
        "a": "SKF NCF 2338 ECJB/PEX is a high-capacity cylindrical roller bearing with 190 mm bore, 400 mm OD and 132 mm width per ISO 15. SKF lists C 2240 kN, C0 2750 kN, Pu 255 kN, reference speed 1,700 r/min and limiting speed 2,200 r/min, mass about 78000 g."
      },
      {
        "q": "What does the NCF designation and ECJB/PEX suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2338-ECJB-PEX take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2338-ECJB-PEX compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2338-ECJB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 190×400×132 mm, but catalogue C/C0 ratings differ between executions (2240/2750 vs 1940/2750 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2338-ECMH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 190×400×132 mm, but catalogue C/C0 ratings differ between executions (2240/2750 vs 1940/2750 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2338-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×400×132 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2338-ECJB-PEX",
      "SKF NCF 2338 ECJB/PEX"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2340-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2340 ECJB",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2200,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 300,
    "max_rpm": 2200,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2200,
    "weight_g": 91500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 200 mm shaft, SKF lists NCF2340-ECJB as high-capacity cylindrical roller: 420 mm OD, 138 mm wide, Pu 300 kN, the catalogue lists 1,400 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 200 mm seat is about 11.00 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 3200 kN for static checks such as crane hook blocks standing under load. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2340 using the /PEX loads.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "The 2200/3200 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2340-ECJB?",
        "a": "SKF NCF 2340 ECJB is a high-capacity cylindrical roller bearing with 200 mm bore, 420 mm OD and 138 mm width per ISO 15. SKF lists C 2200 kN, C0 3200 kN, Pu 300 kN, reference speed 1,400 r/min and limiting speed 2,200 r/min, mass about 91500 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2340-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2340-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2340-ECJB-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2200/3200 vs 2550/3200 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2340-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×420×138 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUH2340-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2200/3200 vs 2550/3200 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2340-ECJB",
      "SKF NCF 2340 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2340-ECJB-PEX",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2340 ECJB/PEX",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2550,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 300,
    "max_rpm": 2200,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2200,
    "weight_g": 91500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2340 ECJB/PEX resolves to a 200×420×138 mm high-capacity cylindrical roller bearing (dimension series 23 (medium-section, wide)); the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB/PEX: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Speed planning for NCF2340-ECJB-PEX: the catalogue lists 1,600 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. The mass entry 91500 g covers the complete catalogue execution. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 2550 kN / C0 3200 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2340-ECJB-PEX as a separate service part: do not substitute the standard NCF 2340 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.",
    "applications": [
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains",
      "large mining mill pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion build and the standard NCF 2340 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 138 mm-wide ring and concentrates load.",
      "The 2550/3200 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2340-ECJB-PEX?",
        "a": "SKF NCF 2340 ECJB/PEX is a high-capacity cylindrical roller bearing with 200 mm bore, 420 mm OD and 138 mm width per ISO 15. SKF lists C 2550 kN, C0 3200 kN, Pu 300 kN, reference speed 1,600 r/min and limiting speed 2,200 r/min, mass about 91500 g."
      },
      {
        "q": "What does the NCF designation and ECJB/PEX suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2340-ECJB-PEX take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2340-ECJB-PEX compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2340-ECJB",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2550/3200 vs 2200/3200 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2340-ECMH",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2550/3200 vs 2200/3200 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      },
      {
        "equiv_sku": "NUH2340-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×420×138 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2340-ECJB-PEX",
      "SKF NCF 2340 ECJB/PEX"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2344-ECJB",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2344 ECJB",
    "series": "NCF2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 2510,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 335,
    "max_rpm": 2000,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2000,
    "weight_g": 116000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 220 mm shaft, SKF lists NCF2344-ECJB as high-capacity cylindrical roller: 460 mm OD, 145 mm wide, Pu 335 kN, the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Speed planning for NCF2344-ECJB: the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The mass entry 116000 g covers the complete catalogue execution. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.",
    "applications": [
      "large mining mill pinion shafts",
      "multi-megawatt wind turbine main gearboxes",
      "offshore and marine heavy drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.",
      "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2344 using the /PEX loads.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 145 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.",
      "The 2510/3650 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2344-ECJB?",
        "a": "SKF NCF 2344 ECJB is a high-capacity cylindrical roller bearing with 220 mm bore, 460 mm OD and 145 mm width per ISO 15. SKF lists C 2510 kN, C0 3650 kN, Pu 335 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 116000 g."
      },
      {
        "q": "What does the NCF designation and ECJB suffix mean?",
        "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope."
      },
      {
        "q": "Can NCF2344-ECJB take axial load and locate the shaft?",
        "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially."
      },
      {
        "q": "How does NCF2344-ECJB compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUH2344-ECMH",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×460×145 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUH2344-ECMH-PEX",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 220×460×145 mm, but catalogue C/C0 ratings differ between executions (2510/3650 vs 2900/3650 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2344-ECJB",
      "SKF NCF 2344 ECJB"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-500-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/500 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 620,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1340,
    "static_load_kN": 3350,
    "fatigue_load_limit_kN": 275,
    "max_rpm": 480,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 480,
    "weight_g": 47000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 28/500 V resolves to a 500×620×72 mm single-row full-complement cylindrical roller bearing (dimension series 28 (slim section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 1340 kN and C0 3350 kN, size the bearing on the 500×620 mm ISO 15 envelope and check the 275 kN Pu against the equivalent-load floor; the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. Fit practice for NCF28-500-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 480 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.",
      "The 1340/3350 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-500-V?",
        "a": "SKF NCF 28/500 V is a single-row full-complement cylindrical roller bearing with 500 mm bore, 620 mm OD and 72 mm width per ISO 15. SKF lists C 1340 kN, C0 3350 kN, Pu 275 kN, reference speed 380 r/min and limiting speed 480 r/min, mass about 47000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-500-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-500-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-500-V",
      "SKF NCF 28/500 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-530-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/530 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 530,
    "D_mm": 650,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1400,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 285,
    "max_rpm": 450,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 450,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 530 mm shaft, SKF lists NCF28-530-V as single-row full-complement cylindrical roller: 650 mm OD, 72 mm wide, Pu 285 kN, the catalogue lists 360 r/min thermal reference speed and 450 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF28-530-V: the catalogue lists 360 r/min thermal reference speed and 450 r/min mechanical limiting speed. The mass entry 49500 g covers the complete catalogue execution. Fit practice for NCF28-530-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1400/3450 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-530-V?",
        "a": "SKF NCF 28/530 V is a single-row full-complement cylindrical roller bearing with 530 mm bore, 650 mm OD and 72 mm width per ISO 15. SKF lists C 1400 kN, C0 3450 kN, Pu 285 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 49500 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-530-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-530-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-530-V",
      "SKF NCF 28/530 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-560-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/560 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 560,
    "D_mm": 680,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1420,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 300,
    "max_rpm": 430,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 430,
    "weight_g": 54000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 28/560 V resolves to a 560×680×72 mm single-row full-complement cylindrical roller bearing (dimension series 28 (slim section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.57 (3650 against 1420 kN), and the Pu figure 300 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 340 r/min thermal reference speed and 430 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 430 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "The 1420/3650 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-560-V?",
        "a": "SKF NCF 28/560 V is a single-row full-complement cylindrical roller bearing with 560 mm bore, 680 mm OD and 72 mm width per ISO 15. SKF lists C 1420 kN, C0 3650 kN, Pu 300 kN, reference speed 340 r/min and limiting speed 430 r/min, mass about 54000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-560-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-560-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-560-V",
      "SKF NCF 28/560 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-600-V-HB1",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/600 V/HB1",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 600,
    "D_mm": 730,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1570,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 340,
    "max_rpm": 400,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 400,
    "weight_g": 67500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 600 mm shaft, SKF lists NCF28-600-V-HB1 as single-row full-complement cylindrical roller: 730 mm OD, 78 mm wide, Pu 340 kN, the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1570 kN and C0 4300 kN, size the bearing on the 600×730 mm ISO 15 envelope and check the 340 kN Pu against the equivalent-load floor; the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1570/4300 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-600-V-HB1?",
        "a": "SKF NCF 28/600 V/HB1 is a single-row full-complement cylindrical roller bearing with 600 mm bore, 730 mm OD and 78 mm width per ISO 15. SKF lists C 1570 kN, C0 4300 kN, Pu 340 kN, reference speed 320 r/min and limiting speed 400 r/min, mass about 67500 g."
      },
      {
        "q": "What does the NCF designation and V/HB1 suffix mean?",
        "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-600-V-HB1 take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-600-V-HB1 compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-600-V-HB1",
      "SKF NCF 28/600 V/HB1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-630-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/630 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 630,
    "D_mm": 780,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1940,
    "static_load_kN": 5000,
    "fatigue_load_limit_kN": 390,
    "max_rpm": 360,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 360,
    "weight_g": 92000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 28/630 V is a single-row full-complement cylindrical roller bearing sized 630×780×88 mm — a dimension series 28 (slim section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 630 mm seat is about 3.08 kN/mm, typical of dimension series 28 (slim section, wide); use C0 5000 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 630 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 360 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 780 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1940/5000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-630-V?",
        "a": "SKF NCF 28/630 V is a single-row full-complement cylindrical roller bearing with 630 mm bore, 780 mm OD and 88 mm width per ISO 15. SKF lists C 1940 kN, C0 5000 kN, Pu 390 kN, reference speed 300 r/min and limiting speed 360 r/min, mass about 92000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-630-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-630-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-630-V",
      "SKF NCF 28/630 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-670-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/670 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 670,
    "D_mm": 820,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1940,
    "static_load_kN": 5300,
    "fatigue_load_limit_kN": 415,
    "max_rpm": 340,
    "reference_speed_rpm": 280,
    "limiting_speed_rpm": 340,
    "weight_g": 98000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 670 mm shaft, SKF lists NCF28-670-V as single-row full-complement cylindrical roller: 820 mm OD, 88 mm wide, Pu 415 kN, the catalogue lists 280 r/min thermal reference speed and 340 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 670 mm seat is about 2.90 kN/mm, typical of dimension series 28 (slim section, wide); use C0 5300 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 670 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 340 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 820 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 88 mm-wide ring and concentrates load.",
      "The 1940/5300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-670-V?",
        "a": "SKF NCF 28/670 V is a single-row full-complement cylindrical roller bearing with 670 mm bore, 820 mm OD and 88 mm width per ISO 15. SKF lists C 1940 kN, C0 5300 kN, Pu 415 kN, reference speed 280 r/min and limiting speed 340 r/min, mass about 98000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-670-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-670-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-670-V",
      "SKF NCF 28/670 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-710-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/710 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 710,
    "D_mm": 870,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2330,
    "static_load_kN": 6300,
    "fatigue_load_limit_kN": 480,
    "max_rpm": 320,
    "reference_speed_rpm": 260,
    "limiting_speed_rpm": 320,
    "weight_g": 115000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 710 mm shaft, SKF lists NCF28-710-V as single-row full-complement cylindrical roller: 870 mm OD, 95 mm wide, Pu 480 kN, the catalogue lists 260 r/min thermal reference speed and 320 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 80.0 mm and the catalogue mass 115000 g; at 2330 kN dynamic rating this is roughly 3.28 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 320 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.",
      "The 2330/6300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-710-V?",
        "a": "SKF NCF 28/710 V is a single-row full-complement cylindrical roller bearing with 710 mm bore, 870 mm OD and 95 mm width per ISO 15. SKF lists C 2330 kN, C0 6300 kN, Pu 480 kN, reference speed 260 r/min and limiting speed 320 r/min, mass about 115000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-710-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-710-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-710-V",
      "SKF NCF 28/710 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-750-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/750 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 750,
    "D_mm": 920,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2640,
    "static_load_kN": 6950,
    "fatigue_load_limit_kN": 520,
    "max_rpm": 300,
    "reference_speed_rpm": 240,
    "limiting_speed_rpm": 300,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF28-750-V is the 750 mm bore entry in the NCF2800 range: a 750×920×100 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2640 kN / C0 6950 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 85.0 mm and the catalogue mass 139000 g; at 2640 kN dynamic rating this is roughly 3.52 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 920 mm raceway.",
      "The 2640/6950 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-750-V?",
        "a": "SKF NCF 28/750 V is a single-row full-complement cylindrical roller bearing with 750 mm bore, 920 mm OD and 100 mm width per ISO 15. SKF lists C 2640 kN, C0 6950 kN, Pu 520 kN, reference speed 240 r/min and limiting speed 300 r/min, mass about 139000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-750-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-750-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-750-V",
      "SKF NCF 28/750 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-800-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/800 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 800,
    "D_mm": 980,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2750,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 550,
    "max_rpm": 280,
    "reference_speed_rpm": 220,
    "limiting_speed_rpm": 280,
    "weight_g": 169000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF28-800-V is the 800 mm bore entry in the NCF2800 range: a 800×980×106 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2750 kN / C0 7500 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.73 (7500 against 2750 kN), and the Pu figure 550 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 220 r/min thermal reference speed and 280 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 280 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 980 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 980 mm raceway.",
      "The 2750/7500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-800-V?",
        "a": "SKF NCF 28/800 V is a single-row full-complement cylindrical roller bearing with 800 mm bore, 980 mm OD and 106 mm width per ISO 15. SKF lists C 2750 kN, C0 7500 kN, Pu 550 kN, reference speed 220 r/min and limiting speed 280 r/min, mass about 169000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-800-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-800-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-800-V",
      "SKF NCF 28/800 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-850-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/850 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 850,
    "D_mm": 1030,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2860,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 570,
    "max_rpm": 260,
    "reference_speed_rpm": 200,
    "limiting_speed_rpm": 260,
    "weight_g": 175000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF28-850-V is the 850 mm bore entry in the NCF2800 range: a 850×1030×106 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2860 kN / C0 8000 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 2860 kN and C0 8000 kN, size the bearing on the 850×1030 mm ISO 15 envelope and check the 570 kN Pu against the equivalent-load floor; the catalogue lists 200 r/min thermal reference speed and 260 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 850 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 260 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1030 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1030 mm raceway.",
      "The 2860/8000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-850-V?",
        "a": "SKF NCF 28/850 V is a single-row full-complement cylindrical roller bearing with 850 mm bore, 1030 mm OD and 106 mm width per ISO 15. SKF lists C 2860 kN, C0 8000 kN, Pu 570 kN, reference speed 200 r/min and limiting speed 260 r/min, mass about 175000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-850-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-850-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-850-V",
      "SKF NCF 28/850 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-900-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/900 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 900,
    "D_mm": 1090,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3190,
    "static_load_kN": 9150,
    "fatigue_load_limit_kN": 655,
    "max_rpm": 240,
    "reference_speed_rpm": 190,
    "limiting_speed_rpm": 240,
    "weight_g": 210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 900 mm shaft, SKF lists NCF28-900-V as single-row full-complement cylindrical roller: 1090 mm OD, 112 mm wide, Pu 655 kN, the catalogue lists 190 r/min thermal reference speed and 240 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 95.0 mm and the catalogue mass 210000 g; at 3190 kN dynamic rating this is roughly 3.54 kN of C per millimetre of bore before application factors. Fit practice for NCF28-900-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 240 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 112 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1090 mm raceway.",
      "The 3190/9150 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-900-V?",
        "a": "SKF NCF 28/900 V is a single-row full-complement cylindrical roller bearing with 900 mm bore, 1090 mm OD and 112 mm width per ISO 15. SKF lists C 3190 kN, C0 9150 kN, Pu 655 kN, reference speed 190 r/min and limiting speed 240 r/min, mass about 210000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-900-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-900-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-900-V",
      "SKF NCF 28/900 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF28-950-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 28/950 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 950,
    "D_mm": 1150,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3410,
    "static_load_kN": 9800,
    "fatigue_load_limit_kN": 655,
    "max_rpm": 220,
    "reference_speed_rpm": 170,
    "limiting_speed_rpm": 220,
    "weight_g": 240000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 950 mm shaft, SKF lists NCF28-950-V as single-row full-complement cylindrical roller: 1150 mm OD, 118 mm wide, Pu 655 kN, the catalogue lists 170 r/min thermal reference speed and 220 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF28-950-V: the catalogue lists 170 r/min thermal reference speed and 220 r/min mechanical limiting speed. The mass entry 240000 g covers the complete catalogue execution. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 220 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1150 mm raceway.",
      "The 3410/9800 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF28-950-V?",
        "a": "SKF NCF 28/950 V is a single-row full-complement cylindrical roller bearing with 950 mm bore, 1150 mm OD and 118 mm width per ISO 15. SKF lists C 3410 kN, C0 9800 kN, Pu 655 kN, reference speed 170 r/min and limiting speed 220 r/min, mass about 240000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF28-950-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF28-950-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF28-950-V",
      "SKF NCF 28/950 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2888-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2888 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 540,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1060,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 232,
    "max_rpm": 560,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 560,
    "weight_g": 30000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2888 V resolves to a 440×540×60 mm single-row full-complement cylindrical roller bearing (dimension series 28 (slim section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 440 mm seat is about 2.41 kN/mm, typical of dimension series 28 (slim section, wide); use C0 2700 kN for static checks such as crane hook blocks standing under load. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 560 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.",
      "The 1060/2700 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2888-V?",
        "a": "SKF NCF 2888 V is a single-row full-complement cylindrical roller bearing with 440 mm bore, 540 mm OD and 60 mm width per ISO 15. SKF lists C 1060 kN, C0 2700 kN, Pu 232 kN, reference speed 450 r/min and limiting speed 560 r/min, mass about 30000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2888-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2888-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2888",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2888-V",
      "SKF NCF 2888 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2892-V-HB1",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2892 V/HB1",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 580,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1300,
    "static_load_kN": 3050,
    "fatigue_load_limit_kN": 260,
    "max_rpm": 530,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 530,
    "weight_g": 44000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 460 mm shaft, SKF lists NCF2892-V-HB1 as single-row full-complement cylindrical roller: 580 mm OD, 72 mm wide, Pu 260 kN, the catalogue lists 430 r/min thermal reference speed and 530 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 460 mm seat is about 2.83 kN/mm, typical of dimension series 28 (slim section, wide); use C0 3050 kN for static checks such as crane hook blocks standing under load. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 530 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1300/3050 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2892-V-HB1?",
        "a": "SKF NCF 2892 V/HB1 is a single-row full-complement cylindrical roller bearing with 460 mm bore, 580 mm OD and 72 mm width per ISO 15. SKF lists C 1300 kN, C0 3050 kN, Pu 260 kN, reference speed 430 r/min and limiting speed 530 r/min, mass about 44000 g."
      },
      {
        "q": "What does the NCF designation and V/HB1 suffix mean?",
        "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2892-V-HB1 take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2892-V-HB1 compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2892",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2892-V-HB1",
      "SKF NCF 2892 V/HB1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2896-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2896 V",
    "series": "NCF2800-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 600,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1320,
    "static_load_kN": 3150,
    "fatigue_load_limit_kN": 265,
    "max_rpm": 500,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 500,
    "weight_g": 46000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2896 V resolves to a 480×600×72 mm single-row full-complement cylindrical roller bearing (dimension series 28 (slim section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 480 mm seat is about 2.75 kN/mm, typical of dimension series 28 (slim section, wide); use C0 3150 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 480 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 600 mm raceway.",
      "The 1320/3150 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2896-V?",
        "a": "SKF NCF 2896 V is a single-row full-complement cylindrical roller bearing with 480 mm bore, 600 mm OD and 72 mm width per ISO 15. SKF lists C 1320 kN, C0 3150 kN, Pu 265 kN, reference speed 400 r/min and limiting speed 500 r/min, mass about 46000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2896-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2896-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2896",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2896-V",
      "SKF NCF 2896 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-500-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/500 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2380,
    "static_load_kN": 5300,
    "fatigue_load_limit_kN": 430,
    "max_rpm": 450,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 450,
    "weight_g": 100000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 29/500 V is a single-row full-complement cylindrical roller bearing sized 500×670×100 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 500 mm seat is about 4.76 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 5300 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 500 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 670 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 100 mm-wide ring and concentrates load.",
      "The 2380/5300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-500-V?",
        "a": "SKF NCF 29/500 V is a single-row full-complement cylindrical roller bearing with 500 mm bore, 670 mm OD and 100 mm width per ISO 15. SKF lists C 2380 kN, C0 5300 kN, Pu 430 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 100000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-500-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-500-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-500-V",
      "SKF NCF 29/500 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-530-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/530 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 530,
    "D_mm": 710,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2700,
    "static_load_kN": 6000,
    "fatigue_load_limit_kN": 465,
    "max_rpm": 430,
    "reference_speed_rpm": 340,
    "limiting_speed_rpm": 430,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF29-530-V is the 530 mm bore entry in the NCF2900 range: a 530×710×106 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2700 kN / C0 6000 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.22 (6000 against 2700 kN), and the Pu figure 465 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 340 r/min thermal reference speed and 430 r/min mechanical limiting speed. Fit practice for NCF29-530-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 430 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 710 mm raceway.",
      "The 2700/6000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-530-V?",
        "a": "SKF NCF 29/530 V is a single-row full-complement cylindrical roller bearing with 530 mm bore, 710 mm OD and 106 mm width per ISO 15. SKF lists C 2700 kN, C0 6000 kN, Pu 465 kN, reference speed 340 r/min and limiting speed 430 r/min, mass about 120000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-530-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-530-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-530-V",
      "SKF NCF 29/530 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-560-V-HB1",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/560 V/HB1",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 560,
    "D_mm": 750,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3030,
    "static_load_kN": 6700,
    "fatigue_load_limit_kN": 490,
    "max_rpm": 400,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 400,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 29/560 V/HB1 denotes a single-row full-complement cylindrical roller bearing on the ISO 15 560×750×112 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 140000 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V/HB1: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 3030 kN and C0 6700 kN, size the bearing on the 560×750 mm ISO 15 envelope and check the 490 kN Pu against the equivalent-load floor; the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 112 mm-wide ring and concentrates load.",
      "The 3030/6700 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-560-V-HB1?",
        "a": "SKF NCF 29/560 V/HB1 is a single-row full-complement cylindrical roller bearing with 560 mm bore, 750 mm OD and 112 mm width per ISO 15. SKF lists C 3030 kN, C0 6700 kN, Pu 490 kN, reference speed 320 r/min and limiting speed 400 r/min, mass about 140000 g."
      },
      {
        "q": "What does the NCF designation and V/HB1 suffix mean?",
        "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-560-V-HB1 take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-560-V-HB1 compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-560-V-HB1",
      "SKF NCF 29/560 V/HB1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-600-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/600 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 600,
    "D_mm": 800,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3360,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 550,
    "max_rpm": 380,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 380,
    "weight_g": 170000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 29/600 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 600×800×118 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 170000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.23 (7500 against 3360 kN), and the Pu figure 550 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 300 r/min thermal reference speed and 380 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 380 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.",
      "The 3360/7500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-600-V?",
        "a": "SKF NCF 29/600 V is a single-row full-complement cylindrical roller bearing with 600 mm bore, 800 mm OD and 118 mm width per ISO 15. SKF lists C 3360 kN, C0 7500 kN, Pu 550 kN, reference speed 300 r/min and limiting speed 380 r/min, mass about 170000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-600-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-600-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-600-V",
      "SKF NCF 29/600 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-630-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/630 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3740,
    "static_load_kN": 8650,
    "fatigue_load_limit_kN": 610,
    "max_rpm": 340,
    "reference_speed_rpm": 280,
    "limiting_speed_rpm": 340,
    "weight_g": 205000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 630 mm shaft, SKF lists NCF29-630-V as single-row full-complement cylindrical roller: 850 mm OD, 128 mm wide, Pu 610 kN, the catalogue lists 280 r/min thermal reference speed and 340 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 3740 kN and C0 8650 kN, size the bearing on the 630×850 mm ISO 15 envelope and check the 610 kN Pu against the equivalent-load floor; the catalogue lists 280 r/min thermal reference speed and 340 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 630 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 340 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 128 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 850 mm raceway.",
      "The 3740/8650 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-630-V?",
        "a": "SKF NCF 29/630 V is a single-row full-complement cylindrical roller bearing with 630 mm bore, 850 mm OD and 128 mm width per ISO 15. SKF lists C 3740 kN, C0 8650 kN, Pu 610 kN, reference speed 280 r/min and limiting speed 340 r/min, mass about 205000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-630-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-630-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-630-V",
      "SKF NCF 29/630 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-670-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/670 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 670,
    "D_mm": 900,
    "B_mm": 136,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3910,
    "static_load_kN": 9000,
    "fatigue_load_limit_kN": 630,
    "max_rpm": 320,
    "reference_speed_rpm": 260,
    "limiting_speed_rpm": 320,
    "weight_g": 245000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF29-670-V is the 670 mm bore entry in the NCF2900 range: a 670×900×136 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 3910 kN / C0 9000 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.30 (9000 against 3910 kN), and the Pu figure 630 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 260 r/min thermal reference speed and 320 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 320 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 900 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 900 mm raceway.",
      "The 3910/9000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-670-V?",
        "a": "SKF NCF 29/670 V is a single-row full-complement cylindrical roller bearing with 670 mm bore, 900 mm OD and 136 mm width per ISO 15. SKF lists C 3910 kN, C0 9000 kN, Pu 630 kN, reference speed 260 r/min and limiting speed 320 r/min, mass about 245000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-670-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-670-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-670-V",
      "SKF NCF 29/670 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-710-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/710 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 710,
    "D_mm": 950,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 4290,
    "static_load_kN": 10000,
    "fatigue_load_limit_kN": 695,
    "max_rpm": 300,
    "reference_speed_rpm": 240,
    "limiting_speed_rpm": 300,
    "weight_g": 275000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 29/710 V resolves to a 710×950×140 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF29-710-V: the catalogue lists 240 r/min thermal reference speed and 300 r/min mechanical limiting speed. The mass entry 275000 g covers the complete catalogue execution. Fit practice for NCF29-710-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 4290/10000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-710-V?",
        "a": "SKF NCF 29/710 V is a single-row full-complement cylindrical roller bearing with 710 mm bore, 950 mm OD and 140 mm width per ISO 15. SKF lists C 4290 kN, C0 10000 kN, Pu 695 kN, reference speed 240 r/min and limiting speed 300 r/min, mass about 275000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-710-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-710-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-710-V",
      "SKF NCF 29/710 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-750-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/750 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 750,
    "D_mm": 1000,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 4460,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 710,
    "max_rpm": 280,
    "reference_speed_rpm": 220,
    "limiting_speed_rpm": 280,
    "weight_g": 313000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 29/750 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 750×1000×145 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 313000 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF29-750-V: the catalogue lists 220 r/min thermal reference speed and 280 r/min mechanical limiting speed. The mass entry 313000 g covers the complete catalogue execution. Fit practice for NCF29-750-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 280 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 145 mm-wide ring and concentrates load.",
      "The 4460/10600 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-750-V?",
        "a": "SKF NCF 29/750 V is a single-row full-complement cylindrical roller bearing with 750 mm bore, 1000 mm OD and 145 mm width per ISO 15. SKF lists C 4460 kN, C0 10600 kN, Pu 710 kN, reference speed 220 r/min and limiting speed 280 r/min, mass about 313000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-750-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-750-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-750-V",
      "SKF NCF 29/750 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-800-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/800 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 800,
    "D_mm": 1060,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 4950,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 800,
    "max_rpm": 260,
    "reference_speed_rpm": 200,
    "limiting_speed_rpm": 260,
    "weight_g": 359000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 29/800 V resolves to a 800×1060×150 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 4950 kN and C0 12000 kN, size the bearing on the 800×1060 mm ISO 15 envelope and check the 800 kN Pu against the equivalent-load floor; the catalogue lists 200 r/min thermal reference speed and 260 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 260 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1060 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 150 mm-wide ring and concentrates load.",
      "The 4950/12000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-800-V?",
        "a": "SKF NCF 29/800 V is a single-row full-complement cylindrical roller bearing with 800 mm bore, 1060 mm OD and 150 mm width per ISO 15. SKF lists C 4950 kN, C0 12000 kN, Pu 800 kN, reference speed 200 r/min and limiting speed 260 r/min, mass about 359000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-800-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-800-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-800-V",
      "SKF NCF 29/800 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-850-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/850 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 850,
    "D_mm": 1120,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 5230,
    "static_load_kN": 12700,
    "fatigue_load_limit_kN": 830,
    "max_rpm": 240,
    "reference_speed_rpm": 190,
    "limiting_speed_rpm": 240,
    "weight_g": 406000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 29/850 V resolves to a 850×1120×155 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 850 mm seat is about 6.15 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 12700 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 850 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 240 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1120 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 155 mm-wide ring and concentrates load.",
      "The 5230/12700 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-850-V?",
        "a": "SKF NCF 29/850 V is a single-row full-complement cylindrical roller bearing with 850 mm bore, 1120 mm OD and 155 mm width per ISO 15. SKF lists C 5230 kN, C0 12700 kN, Pu 830 kN, reference speed 190 r/min and limiting speed 240 r/min, mass about 406000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-850-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-850-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-850-V",
      "SKF NCF 29/850 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-900-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/900 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 900,
    "D_mm": 1180,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 5940,
    "static_load_kN": 14600,
    "fatigue_load_limit_kN": 950,
    "max_rpm": 220,
    "reference_speed_rpm": 170,
    "limiting_speed_rpm": 220,
    "weight_g": 472000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF29-900-V is the 900 mm bore entry in the NCF2900 range: a 900×1180×165 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 5940 kN / C0 14600 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF29-900-V: the catalogue lists 170 r/min thermal reference speed and 220 r/min mechanical limiting speed. The mass entry 472000 g covers the complete catalogue execution. Fit practice for NCF29-900-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 220 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 165 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 165 mm-wide ring and concentrates load.",
      "The 5940/14600 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-900-V?",
        "a": "SKF NCF 29/900 V is a single-row full-complement cylindrical roller bearing with 900 mm bore, 1180 mm OD and 165 mm width per ISO 15. SKF lists C 5940 kN, C0 14600 kN, Pu 950 kN, reference speed 170 r/min and limiting speed 220 r/min, mass about 472000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-900-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-900-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-900-V",
      "SKF NCF 29/900 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF29-950-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 29/950 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 950,
    "D_mm": 1250,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 6600,
    "static_load_kN": 16300,
    "fatigue_load_limit_kN": 1020,
    "max_rpm": 200,
    "reference_speed_rpm": 160,
    "limiting_speed_rpm": 200,
    "weight_g": 565000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF29-950-V is the 950 mm bore entry in the NCF2900 range: a 950×1250×175 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 6600 kN / C0 16300 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.47 (16300 against 6600 kN), and the Pu figure 1020 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 160 r/min thermal reference speed and 200 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 175 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 175 mm-wide ring and concentrates load.",
      "The 6600/16300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF29-950-V?",
        "a": "SKF NCF 29/950 V is a single-row full-complement cylindrical roller bearing with 950 mm bore, 1250 mm OD and 175 mm width per ISO 15. SKF lists C 6600 kN, C0 16300 kN, Pu 1020 kN, reference speed 160 r/min and limiting speed 200 r/min, mass about 565000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF29-950-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF29-950-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF29",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF29-950-V",
      "SKF NCF 29/950 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2912-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2912 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 85,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 55,
    "static_load_kN": 80,
    "fatigue_load_limit_kN": 9.15,
    "max_rpm": 4500,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4500,
    "weight_g": 270,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2912-CV is the 60 mm bore entry in the NCF2900 range: a 60×85×16 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 55 kN / C0 80 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.45 (80 against 55 kN), and the Pu figure 9.15 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,600 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. Fit practice for NCF2912-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 4,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 85 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 55/80 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2912-CV?",
        "a": "SKF NCF 2912 CV is a single-row full-complement cylindrical roller bearing with 60 mm bore, 85 mm OD and 16 mm width per ISO 15. SKF lists C 55 kN, C0 80 kN, Pu 9.15 kN, reference speed 3,600 r/min and limiting speed 4,500 r/min, mass about 270 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2912-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2912-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2912",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2912-CV",
      "SKF NCF 2912 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2913-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2913 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 90,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 58.3,
    "static_load_kN": 88,
    "fatigue_load_limit_kN": 10.2,
    "max_rpm": 4000,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 4000,
    "weight_g": 310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 65 mm shaft, SKF lists NCF2913-CV as single-row full-complement cylindrical roller: 90 mm OD, 16 mm wide, Pu 10.2 kN, the catalogue lists 3,200 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2913-CV: the catalogue lists 3,200 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The mass entry 310 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 65 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 4,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 58.3/88 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2913-CV?",
        "a": "SKF NCF 2913 CV is a single-row full-complement cylindrical roller bearing with 65 mm bore, 90 mm OD and 16 mm width per ISO 15. SKF lists C 58.3 kN, C0 88 kN, Pu 10.2 kN, reference speed 3,200 r/min and limiting speed 4,000 r/min, mass about 310 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2913-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2913-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2913",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2913-CV",
      "SKF NCF 2913 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2914-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2914 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 100,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 76.5,
    "static_load_kN": 116,
    "fatigue_load_limit_kN": 13.7,
    "max_rpm": 3800,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3800,
    "weight_g": 490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2914 CV is a single-row full-complement cylindrical roller bearing sized 70×100×19 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.52 (116 against 76.5 kN), and the Pu figure 13.7 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,000 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Fit practice for NCF2914-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "The 76.5/116 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2914-CV?",
        "a": "SKF NCF 2914 CV is a single-row full-complement cylindrical roller bearing with 70 mm bore, 100 mm OD and 19 mm width per ISO 15. SKF lists C 76.5 kN, C0 116 kN, Pu 13.7 kN, reference speed 3,000 r/min and limiting speed 3,800 r/min, mass about 490 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2914-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2914-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2914",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2914-CV",
      "SKF NCF 2914 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2915-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2915 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 105,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 79.2,
    "static_load_kN": 125,
    "fatigue_load_limit_kN": 14.6,
    "max_rpm": 3600,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3600,
    "weight_g": 520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2915 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 75×105×19 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 520 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 79.2 kN and C0 125 kN, size the bearing on the 75×105 mm ISO 15 envelope and check the 14.6 kN Pu against the equivalent-load floor; the catalogue lists 2,800 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 105 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.",
      "The 79.2/125 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2915-CV?",
        "a": "SKF NCF 2915 CV is a single-row full-complement cylindrical roller bearing with 75 mm bore, 105 mm OD and 19 mm width per ISO 15. SKF lists C 79.2 kN, C0 125 kN, Pu 14.6 kN, reference speed 2,800 r/min and limiting speed 3,600 r/min, mass about 520 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2915-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2915-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2915",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2915-CV",
      "SKF NCF 2915 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2916-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2916 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 110,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 80.9,
    "static_load_kN": 132,
    "fatigue_load_limit_kN": 15.6,
    "max_rpm": 3400,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3400,
    "weight_g": 550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2916 CV resolves to a 80×110×19 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.63 (132 against 80.9 kN), and the Pu figure 15.6 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,600 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Fit practice for NCF2916-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.",
      "The 80.9/132 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2916-CV?",
        "a": "SKF NCF 2916 CV is a single-row full-complement cylindrical roller bearing with 80 mm bore, 110 mm OD and 19 mm width per ISO 15. SKF lists C 80.9 kN, C0 132 kN, Pu 15.6 kN, reference speed 2,600 r/min and limiting speed 3,400 r/min, mass about 550 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2916-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2916-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2916",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2916-CV",
      "SKF NCF 2916 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2917-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2917 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 120,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 102,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 20.4,
    "max_rpm": 6300,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6300,
    "weight_g": 810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2917-CV is the 85 mm bore entry in the NCF2900 range: a 85×120×22 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 102 kN / C0 166 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 102 kN and C0 166 kN, size the bearing on the 85×120 mm ISO 15 envelope and check the 20.4 kN Pu against the equivalent-load floor; the catalogue lists 6,300 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 6,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 102/166 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2917-CV?",
        "a": "SKF NCF 2917 CV is a single-row full-complement cylindrical roller bearing with 85 mm bore, 120 mm OD and 22 mm width per ISO 15. SKF lists C 102 kN, C0 166 kN, Pu 20.4 kN, reference speed 6,300 r/min and limiting speed 6,300 r/min, mass about 810 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2917-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2917-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2917",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2917-CV",
      "SKF NCF 2917 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2918-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2918 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 125,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 105,
    "static_load_kN": 176,
    "fatigue_load_limit_kN": 20.8,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 840,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 90 mm shaft, SKF lists NCF2918-CV as single-row full-complement cylindrical roller: 125 mm OD, 22 mm wide, Pu 20.8 kN, the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.68 (176 against 105 kN), and the Pu figure 20.8 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Fit practice for NCF2918-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 105/176 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2918-CV?",
        "a": "SKF NCF 2918 CV is a single-row full-complement cylindrical roller bearing with 90 mm bore, 125 mm OD and 22 mm width per ISO 15. SKF lists C 105 kN, C0 176 kN, Pu 20.8 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 840 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2918-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2918-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2918",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2918-CV",
      "SKF NCF 2918 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2920-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2920 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 140,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 128,
    "static_load_kN": 200,
    "fatigue_load_limit_kN": 24.5,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2920 CV resolves to a 100×140×24 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2920-CV: the catalogue lists 2,000 r/min thermal reference speed and 2,600 r/min mechanical limiting speed. The mass entry 1100 g covers the complete catalogue execution. Fit practice for NCF2920-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.",
      "The 128/200 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2920-CV?",
        "a": "SKF NCF 2920 CV is a single-row full-complement cylindrical roller bearing with 100 mm bore, 140 mm OD and 24 mm width per ISO 15. SKF lists C 128 kN, C0 200 kN, Pu 24.5 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 1100 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2920-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2920-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2920",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2920-CV",
      "SKF NCF 2920 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2922-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2922 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 150,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 134,
    "static_load_kN": 220,
    "fatigue_load_limit_kN": 26,
    "max_rpm": 2400,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2400,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 110 mm shaft, SKF lists NCF2922-CV as single-row full-complement cylindrical roller: 150 mm OD, 24 mm wide, Pu 26 kN, the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 134 kN and C0 220 kN, size the bearing on the 110×150 mm ISO 15 envelope and check the 26 kN Pu against the equivalent-load floor; the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 134/220 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2922-CV?",
        "a": "SKF NCF 2922 CV is a single-row full-complement cylindrical roller bearing with 110 mm bore, 150 mm OD and 24 mm width per ISO 15. SKF lists C 134 kN, C0 220 kN, Pu 26 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 1200 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2922-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2922-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2922",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2922-CV",
      "SKF NCF 2922 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2924-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2924 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 165,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 172,
    "static_load_kN": 290,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4300,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2924 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 120×165×27 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 1750 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 22.5 mm and the catalogue mass 1750 g; at 172 kN dynamic rating this is roughly 1.43 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 4,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 27 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 165 mm raceway.",
      "The 172/290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2924-CV?",
        "a": "SKF NCF 2924 CV is a single-row full-complement cylindrical roller bearing with 120 mm bore, 165 mm OD and 27 mm width per ISO 15. SKF lists C 172 kN, C0 290 kN, Pu 34.5 kN, reference speed 4,300 r/min and limiting speed 4,300 r/min, mass about 1750 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2924-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2924-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2924",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2924-CV",
      "SKF NCF 2924 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2926-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2926 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 180,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 205,
    "static_load_kN": 360,
    "fatigue_load_limit_kN": 40.5,
    "max_rpm": 2000,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2000,
    "weight_g": 2350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2926-CV is the 130 mm bore entry in the NCF2900 range: a 130×180×30 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 205 kN / C0 360 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 25.0 mm and the catalogue mass 2350 g; at 205 kN dynamic rating this is roughly 1.58 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.",
      "The 205/360 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2926-CV?",
        "a": "SKF NCF 2926 CV is a single-row full-complement cylindrical roller bearing with 130 mm bore, 180 mm OD and 30 mm width per ISO 15. SKF lists C 205 kN, C0 360 kN, Pu 40.5 kN, reference speed 1,600 r/min and limiting speed 2,000 r/min, mass about 2350 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2926-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2926-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2926",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2926-CV",
      "SKF NCF 2926 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2928-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2928 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 190,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 220,
    "static_load_kN": 390,
    "fatigue_load_limit_kN": 43,
    "max_rpm": 1900,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1900,
    "weight_g": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2928 CV is a single-row full-complement cylindrical roller bearing sized 140×190×30 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.77 (390 against 220 kN), and the Pu figure 43 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.",
      "The 220/390 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2928-CV?",
        "a": "SKF NCF 2928 CV is a single-row full-complement cylindrical roller bearing with 140 mm bore, 190 mm OD and 30 mm width per ISO 15. SKF lists C 220 kN, C0 390 kN, Pu 43 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 2400 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2928-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2928-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2928",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2928-CV",
      "SKF NCF 2928 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2930-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2930 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 210,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 292,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 55,
    "max_rpm": 1700,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1700,
    "weight_g": 3750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2930 CV resolves to a 150×210×36 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2930-CV: the catalogue lists 1,400 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. The mass entry 3750 g covers the complete catalogue execution. Fit practice for NCF2930-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 36 mm-wide ring and concentrates load.",
      "The 292/490 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2930-CV?",
        "a": "SKF NCF 2930 CV is a single-row full-complement cylindrical roller bearing with 150 mm bore, 210 mm OD and 36 mm width per ISO 15. SKF lists C 292 kN, C0 490 kN, Pu 55 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 3750 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2930-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2930-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2930",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2930-CV",
      "SKF NCF 2930 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2932-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2932 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 303,
    "static_load_kN": 530,
    "fatigue_load_limit_kN": 58.5,
    "max_rpm": 1600,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1600,
    "weight_g": 4000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 160 mm shaft, SKF lists NCF2932-CV as single-row full-complement cylindrical roller: 220 mm OD, 36 mm wide, Pu 58.5 kN, the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF2932-CV: the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. The mass entry 4000 g covers the complete catalogue execution. Fit practice for NCF2932-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 220 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 303/530 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2932-CV?",
        "a": "SKF NCF 2932 CV is a single-row full-complement cylindrical roller bearing with 160 mm bore, 220 mm OD and 36 mm width per ISO 15. SKF lists C 303 kN, C0 530 kN, Pu 58.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 4000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2932-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2932-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2932",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2932-CV",
      "SKF NCF 2932 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2934-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2934 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 314,
    "static_load_kN": 560,
    "fatigue_load_limit_kN": 60,
    "max_rpm": 1500,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1500,
    "weight_g": 4300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2934 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 170×230×36 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 4300 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2934-CV: the catalogue lists 1,200 r/min thermal reference speed and 1,500 r/min mechanical limiting speed. The mass entry 4300 g covers the complete catalogue execution. Fit practice for NCF2934-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.",
      "The 314/560 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2934-CV?",
        "a": "SKF NCF 2934 CV is a single-row full-complement cylindrical roller bearing with 170 mm bore, 230 mm OD and 36 mm width per ISO 15. SKF lists C 314 kN, C0 560 kN, Pu 60 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 4300 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2934-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2934-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2934",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2934-CV",
      "SKF NCF 2934 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2936-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2936 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 391,
    "static_load_kN": 695,
    "fatigue_load_limit_kN": 75,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 6200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2936-CV is the 180 mm bore entry in the NCF2900 range: a 180×250×42 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 391 kN / C0 695 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 391 kN and C0 695 kN, size the bearing on the 180×250 mm ISO 15 envelope and check the 75 kN Pu against the equivalent-load floor; the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Fit practice for NCF2936-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 42 mm-wide ring and concentrates load.",
      "The 391/695 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2936-CV?",
        "a": "SKF NCF 2936 CV is a single-row full-complement cylindrical roller bearing with 180 mm bore, 250 mm OD and 42 mm width per ISO 15. SKF lists C 391 kN, C0 695 kN, Pu 75 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 6200 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2936-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2936-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2936",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2936-CV",
      "SKF NCF 2936 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2938-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2938 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 440,
    "static_load_kN": 780,
    "fatigue_load_limit_kN": 81.5,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 6500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2938 CV is a single-row full-complement cylindrical roller bearing sized 190×260×42 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 35.0 mm and the catalogue mass 6500 g; at 440 kN dynamic rating this is roughly 2.32 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.",
      "The 440/780 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2938-CV?",
        "a": "SKF NCF 2938 CV is a single-row full-complement cylindrical roller bearing with 190 mm bore, 260 mm OD and 42 mm width per ISO 15. SKF lists C 440 kN, C0 780 kN, Pu 81.5 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 6500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2938-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2938-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2938",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2938-CV",
      "SKF NCF 2938 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2940-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2940 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 528,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 1300,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1300,
    "weight_g": 9100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2940-CV is the 200 mm bore entry in the NCF2900 range: a 200×280×48 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 528 kN / C0 965 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 200 mm seat is about 2.64 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 965 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.",
      "The 528/965 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2940-CV?",
        "a": "SKF NCF 2940 CV is a single-row full-complement cylindrical roller bearing with 200 mm bore, 280 mm OD and 48 mm width per ISO 15. SKF lists C 528 kN, C0 965 kN, Pu 100 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 9100 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2940-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2940-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2940",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2940-CV",
      "SKF NCF 2940 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2944-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2944 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 550,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 106,
    "max_rpm": 1200,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1200,
    "weight_g": 9900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2944 CV resolves to a 220×300×48 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 220 mm seat is about 2.50 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 1060 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.",
      "The 550/1060 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2944-CV?",
        "a": "SKF NCF 2944 CV is a single-row full-complement cylindrical roller bearing with 220 mm bore, 300 mm OD and 48 mm width per ISO 15. SKF lists C 550 kN, C0 1060 kN, Pu 106 kN, reference speed 900 r/min and limiting speed 1,200 r/min, mass about 9900 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2944-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2944-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2944",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2944-CV",
      "SKF NCF 2944 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2948-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2948 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 583,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 114,
    "max_rpm": 1100,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1100,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2948 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 240×320×48 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 10500 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF2948-CV: the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. The mass entry 10500 g covers the complete catalogue execution. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "The 583/1140 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2948-CV?",
        "a": "SKF NCF 2948 CV is a single-row full-complement cylindrical roller bearing with 240 mm bore, 320 mm OD and 48 mm width per ISO 15. SKF lists C 583 kN, C0 1140 kN, Pu 114 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 10500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2948-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2948-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2948",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2948-CV",
      "SKF NCF 2948 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2952-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2952 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 737,
    "static_load_kN": 1430,
    "fatigue_load_limit_kN": 143,
    "max_rpm": 950,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 950,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2952 CV is a single-row full-complement cylindrical roller bearing sized 260×360×60 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.94 (1430 against 737 kN), and the Pu figure 143 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. Fit practice for NCF2952-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 950 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 737/1430 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2952-CV?",
        "a": "SKF NCF 2952 CV is a single-row full-complement cylindrical roller bearing with 260 mm bore, 360 mm OD and 60 mm width per ISO 15. SKF lists C 737 kN, C0 1430 kN, Pu 143 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 18000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2952-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2952-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2952",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2952-CV",
      "SKF NCF 2952 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2956-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2956 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 880,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 166,
    "max_rpm": 900,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 900,
    "weight_g": 19500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 280 mm shaft, SKF lists NCF2956-CV as single-row full-complement cylindrical roller: 380 mm OD, 60 mm wide, Pu 166 kN, the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.97 (1730 against 880 kN), and the Pu figure 166 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. Fit practice for NCF2956-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.",
      "The 880/1730 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2956-CV?",
        "a": "SKF NCF 2956 CV is a single-row full-complement cylindrical roller bearing with 280 mm bore, 380 mm OD and 60 mm width per ISO 15. SKF lists C 880 kN, C0 1730 kN, Pu 166 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 19500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2956-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2956-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2956",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2956-CV",
      "SKF NCF 2956 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2960-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2960 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1120,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 208,
    "max_rpm": 800,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 800,
    "weight_g": 31000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 300 mm shaft, SKF lists NCF2960-CV as single-row full-complement cylindrical roller: 420 mm OD, 72 mm wide, Pu 208 kN, the catalogue lists 630 r/min thermal reference speed and 800 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 60.0 mm and the catalogue mass 31000 g; at 1120 kN dynamic rating this is roughly 3.73 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 300 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "The 1120/2200 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2960-CV?",
        "a": "SKF NCF 2960 CV is a single-row full-complement cylindrical roller bearing with 300 mm bore, 420 mm OD and 72 mm width per ISO 15. SKF lists C 1120 kN, C0 2200 kN, Pu 208 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 31000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2960-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2960-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2960",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2960-CV",
      "SKF NCF 2960 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2964-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2964 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1140,
    "static_load_kN": 2360,
    "fatigue_load_limit_kN": 220,
    "max_rpm": 750,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 750,
    "weight_g": 33000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 320 mm shaft, SKF lists NCF2964-V as single-row full-complement cylindrical roller: 440 mm OD, 72 mm wide, Pu 220 kN, the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 320 mm seat is about 3.56 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 2360 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 320 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 750 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "The 1140/2360 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2964-V?",
        "a": "SKF NCF 2964 V is a single-row full-complement cylindrical roller bearing with 320 mm bore, 440 mm OD and 72 mm width per ISO 15. SKF lists C 1140 kN, C0 2360 kN, Pu 220 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 33000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2964-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2964-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2964",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2964-V",
      "SKF NCF 2964 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2968-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2968 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1190,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 228,
    "max_rpm": 700,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 700,
    "weight_g": 35000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2968 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 340×460×72 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 35000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 60.0 mm and the catalogue mass 35000 g; at 1190 kN dynamic rating this is roughly 3.50 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "The 1190/2500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2968-V?",
        "a": "SKF NCF 2968 V is a single-row full-complement cylindrical roller bearing with 340 mm bore, 460 mm OD and 72 mm width per ISO 15. SKF lists C 1190 kN, C0 2500 kN, Pu 228 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 35000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2968-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2968-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2968",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2968-V",
      "SKF NCF 2968 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2972-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2972 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1230,
    "static_load_kN": 2600,
    "fatigue_load_limit_kN": 240,
    "max_rpm": 670,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 670,
    "weight_g": 36500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 2972 CV resolves to a 360×480×72 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1230 kN and C0 2600 kN, size the bearing on the 360×480 mm ISO 15 envelope and check the 240 kN Pu against the equivalent-load floor; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 670 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1230/2600 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2972-CV?",
        "a": "SKF NCF 2972 CV is a single-row full-complement cylindrical roller bearing with 360 mm bore, 480 mm OD and 72 mm width per ISO 15. SKF lists C 1230 kN, C0 2600 kN, Pu 240 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 36500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2972-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2972-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2972",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2972-CV",
      "SKF NCF 2972 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2976-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2976 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1570,
    "static_load_kN": 3250,
    "fatigue_load_limit_kN": 300,
    "max_rpm": 630,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 630,
    "weight_g": 52000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2976 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 380×520×82 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 52000 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.07 (3250 against 1570 kN), and the Pu figure 300 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 630 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 520 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1570/3250 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2976-V?",
        "a": "SKF NCF 2976 V is a single-row full-complement cylindrical roller bearing with 380 mm bore, 520 mm OD and 82 mm width per ISO 15. SKF lists C 1570 kN, C0 3250 kN, Pu 300 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 52000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2976-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2976-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2976",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2976-V",
      "SKF NCF 2976 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2980-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2980 CV",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1650,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 310,
    "max_rpm": 600,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 600,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2980 CV is a single-row full-complement cylindrical roller bearing sized 400×540×82 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 400 mm seat is about 4.13 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 3450 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 82 mm-wide ring and concentrates load.",
      "The 1650/3450 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2980-CV?",
        "a": "SKF NCF 2980 CV is a single-row full-complement cylindrical roller bearing with 400 mm bore, 540 mm OD and 82 mm width per ISO 15. SKF lists C 1650 kN, C0 3450 kN, Pu 310 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 54500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2980-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2980-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2980",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2980-CV",
      "SKF NCF 2980 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2984-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2984 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1650,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 315,
    "max_rpm": 560,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 560,
    "weight_g": 57000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2984 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 420×560×82 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 57000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF2984-V: the catalogue lists 450 r/min thermal reference speed and 560 r/min mechanical limiting speed. The mass entry 57000 g covers the complete catalogue execution. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 560 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 82 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 560 mm raceway.",
      "The 1650/3600 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2984-V?",
        "a": "SKF NCF 2984 V is a single-row full-complement cylindrical roller bearing with 420 mm bore, 560 mm OD and 82 mm width per ISO 15. SKF lists C 1650 kN, C0 3600 kN, Pu 315 kN, reference speed 450 r/min and limiting speed 560 r/min, mass about 57000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2984-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2984-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2984",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2984-V",
      "SKF NCF 2984 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2988-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2988 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2010,
    "static_load_kN": 4400,
    "fatigue_load_limit_kN": 380,
    "max_rpm": 530,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 530,
    "weight_g": 80000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2988-V is the 440 mm bore entry in the NCF2900 range: a 440×600×95 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2010 kN / C0 4400 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.19 (4400 against 2010 kN), and the Pu figure 380 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 430 r/min thermal reference speed and 530 r/min mechanical limiting speed. Fit practice for NCF2988-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 530 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 600 mm raceway.",
      "The 2010/4400 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2988-V?",
        "a": "SKF NCF 2988 V is a single-row full-complement cylindrical roller bearing with 440 mm bore, 600 mm OD and 95 mm width per ISO 15. SKF lists C 2010 kN, C0 4400 kN, Pu 380 kN, reference speed 430 r/min and limiting speed 530 r/min, mass about 80000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2988-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2988-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2988",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2988-V",
      "SKF NCF 2988 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2992-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2992 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2050,
    "static_load_kN": 4500,
    "fatigue_load_limit_kN": 390,
    "max_rpm": 500,
    "reference_speed_rpm": 400,
    "limiting_speed_rpm": 500,
    "weight_g": 83000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 2992 V is a single-row full-complement cylindrical roller bearing sized 460×620×95 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF2992-V: the catalogue lists 400 r/min thermal reference speed and 500 r/min mechanical limiting speed. The mass entry 83000 g covers the complete catalogue execution. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.",
      "The 2050/4500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2992-V?",
        "a": "SKF NCF 2992 V is a single-row full-complement cylindrical roller bearing with 460 mm bore, 620 mm OD and 95 mm width per ISO 15. SKF lists C 2050 kN, C0 4500 kN, Pu 390 kN, reference speed 400 r/min and limiting speed 500 r/min, mass about 83000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2992-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2992-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2992",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2992-V",
      "SKF NCF 2992 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF2996-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 2996 V",
    "series": "NCF2900-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2290,
    "static_load_kN": 4900,
    "fatigue_load_limit_kN": 405,
    "max_rpm": 480,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 480,
    "weight_g": 93000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF2996-V is the 480 mm bore entry in the NCF2900 range: a 480×650×100 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2290 kN / C0 4900 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.14 (4900 against 2290 kN), and the Pu figure 405 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 480 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 650 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 650 mm raceway.",
      "The 2290/4900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF2996-V?",
        "a": "SKF NCF 2996 V is a single-row full-complement cylindrical roller bearing with 480 mm bore, 650 mm OD and 100 mm width per ISO 15. SKF lists C 2290 kN, C0 4900 kN, Pu 405 kN, reference speed 380 r/min and limiting speed 480 r/min, mass about 93000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF2996-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF2996-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF2996",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF2996-V",
      "SKF NCF 2996 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF30-500-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 30/500 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 167,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3800,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 570,
    "max_rpm": 450,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 450,
    "weight_g": 215000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 30/500 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 500×720×167 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 215000 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 110.0 mm and the catalogue mass 215000 g; at 3800 kN dynamic rating this is roughly 7.60 kN of C per millimetre of bore before application factors. Fit practice for NCF30-500-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 720 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 3800/7500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF30-500-CV?",
        "a": "SKF NCF 30/500 CV is a single-row full-complement cylindrical roller bearing with 500 mm bore, 720 mm OD and 167 mm width per ISO 15. SKF lists C 3800 kN, C0 7500 kN, Pu 570 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 215000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF30-500-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF30-500-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF30",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF30-500-CV",
      "SKF NCF 30/500 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF30-530-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 30/530 V",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 5230,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 780,
    "max_rpm": 400,
    "reference_speed_rpm": 320,
    "limiting_speed_rpm": 400,
    "weight_g": 300000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF30-530-V is the 530 mm bore entry in the NCF3000 range: a 530×780×185 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 5230 kN / C0 10600 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 530 mm seat is about 9.87 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 10600 kN for static checks such as crane hook blocks standing under load. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 185 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 185 mm-wide ring and concentrates load.",
      "The 5230/10600 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF30-530-V?",
        "a": "SKF NCF 30/530 V is a single-row full-complement cylindrical roller bearing with 530 mm bore, 780 mm OD and 185 mm width per ISO 15. SKF lists C 5230 kN, C0 10600 kN, Pu 780 kN, reference speed 320 r/min and limiting speed 400 r/min, mass about 300000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF30-530-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF30-530-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF30",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF30-530-V",
      "SKF NCF 30/530 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF30-560-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 30/560 V",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 5830,
    "static_load_kN": 11800,
    "fatigue_load_limit_kN": 865,
    "max_rpm": 380,
    "reference_speed_rpm": 300,
    "limiting_speed_rpm": 380,
    "weight_g": 345000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 30/560 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 560×820×195 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 345000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 130.0 mm and the catalogue mass 345000 g; at 5830 kN dynamic rating this is roughly 10.41 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 560 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 380 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 195 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 820 mm raceway.",
      "The 5830/11800 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF30-560-V?",
        "a": "SKF NCF 30/560 V is a single-row full-complement cylindrical roller bearing with 560 mm bore, 820 mm OD and 195 mm width per ISO 15. SKF lists C 5830 kN, C0 11800 kN, Pu 865 kN, reference speed 300 r/min and limiting speed 380 r/min, mass about 345000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF30-560-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF30-560-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF30",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF30-560-V",
      "SKF NCF 30/560 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3004-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3004 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 20,
    "D_mm": 42,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 28.1,
    "static_load_kN": 28.5,
    "fatigue_load_limit_kN": 3.1,
    "max_rpm": 10000,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 10000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 3004 CV is a single-row full-complement cylindrical roller bearing sized 20×42×16 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 20 mm seat is about 1.41 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 28.5 kN for static checks such as crane hook blocks standing under load. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "small gearbox low-speed shafts",
      "machine-tool indexing drives",
      "crane trolley wheel hubs"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 10,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.",
      "The 28.1/28.5 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3004-CV?",
        "a": "SKF NCF 3004 CV is a single-row full-complement cylindrical roller bearing with 20 mm bore, 42 mm OD and 16 mm width per ISO 15. SKF lists C 28.1 kN, C0 28.5 kN, Pu 3.1 kN, reference speed 8,500 r/min and limiting speed 10,000 r/min, mass about 110 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3004-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3004-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3004",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3004-CV",
      "SKF NCF 3004 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3005-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3005 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 47,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 31.9,
    "static_load_kN": 35.5,
    "fatigue_load_limit_kN": 3.8,
    "max_rpm": 9000,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 9000,
    "weight_g": 120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3005 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 25×47×16 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 120 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 11.0 mm and the catalogue mass 120 g; at 31.9 kN dynamic rating this is roughly 1.28 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 25 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "crane trolley wheel hubs",
      "small gearbox low-speed shafts",
      "machine-tool indexing drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 9,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 31.9/35.5 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3005-CV?",
        "a": "SKF NCF 3005 CV is a single-row full-complement cylindrical roller bearing with 25 mm bore, 47 mm OD and 16 mm width per ISO 15. SKF lists C 31.9 kN, C0 35.5 kN, Pu 3.8 kN, reference speed 7,000 r/min and limiting speed 9,000 r/min, mass about 120 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3005-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3005-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3005",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3005-CV",
      "SKF NCF 3005 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3006-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3006 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 55,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 39.6,
    "static_load_kN": 44,
    "fatigue_load_limit_kN": 5.3,
    "max_rpm": 15000,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 15000,
    "weight_g": 200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 3006 CV resolves to a 30×55×19 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3006-CV: the catalogue lists 13,000 r/min thermal reference speed and 15,000 r/min mechanical limiting speed. The mass entry 200 g covers the complete catalogue execution. Fit practice for NCF3006-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "slew and swing drives",
      "heavy gearbox output shafts",
      "crane travel-wheel bearings",
      "rolling-mill table rollers"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 15,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 55 mm raceway.",
      "The 39.6/44 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3006-CV?",
        "a": "SKF NCF 3006 CV is a single-row full-complement cylindrical roller bearing with 30 mm bore, 55 mm OD and 19 mm width per ISO 15. SKF lists C 39.6 kN, C0 44 kN, Pu 5.3 kN, reference speed 13,000 r/min and limiting speed 15,000 r/min, mass about 200 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3006-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3006-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3006",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3006-CV",
      "SKF NCF 3006 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3007-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3007 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 48.4,
    "static_load_kN": 56,
    "fatigue_load_limit_kN": 6.55,
    "max_rpm": 6700,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 6700,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF3007-CV is the 35 mm bore entry in the NCF3000 range: a 35×62×20 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 48.4 kN / C0 56 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 13.5 mm and the catalogue mass 260 g; at 48.4 kN dynamic rating this is roughly 1.38 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 35 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "crane travel-wheel bearings",
      "rolling-mill table rollers",
      "slew and swing drives",
      "heavy gearbox output shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 6,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.",
      "The 48.4/56 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3007-CV?",
        "a": "SKF NCF 3007 CV is a single-row full-complement cylindrical roller bearing with 35 mm bore, 62 mm OD and 20 mm width per ISO 15. SKF lists C 48.4 kN, C0 56 kN, Pu 6.55 kN, reference speed 5,300 r/min and limiting speed 6,700 r/min, mass about 260 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3007-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3007-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3007",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3007-CV",
      "SKF NCF 3007 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3008-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3008 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 68,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 57.2,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 8.15,
    "max_rpm": 6000,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 6000,
    "weight_g": 310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 40 mm shaft, SKF lists NCF3008-CV as single-row full-complement cylindrical roller: 68 mm OD, 21 mm wide, Pu 8.15 kN, the catalogue lists 4,800 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3008-CV: the catalogue lists 4,800 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The mass entry 310 g covers the complete catalogue execution. Fit practice for NCF3008-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill table rollers",
      "slew and swing drives",
      "heavy gearbox output shafts",
      "crane travel-wheel bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 6,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.",
      "The 57.2/69.5 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3008-CV?",
        "a": "SKF NCF 3008 CV is a single-row full-complement cylindrical roller bearing with 40 mm bore, 68 mm OD and 21 mm width per ISO 15. SKF lists C 57.2 kN, C0 69.5 kN, Pu 8.15 kN, reference speed 4,800 r/min and limiting speed 6,000 r/min, mass about 310 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3008-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3008-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3008",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3008-CV",
      "SKF NCF 3008 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3009-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3009 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 75,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 60.5,
    "static_load_kN": 78,
    "fatigue_load_limit_kN": 9.15,
    "max_rpm": 5300,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5300,
    "weight_g": 400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 3009 CV is a single-row full-complement cylindrical roller bearing sized 45×75×23 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.29 (78 against 60.5 kN), and the Pu figure 9.15 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,300 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "slew and swing drives",
      "heavy gearbox output shafts",
      "crane travel-wheel bearings",
      "rolling-mill table rollers"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 5,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 60.5/78 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3009-CV?",
        "a": "SKF NCF 3009 CV is a single-row full-complement cylindrical roller bearing with 45 mm bore, 75 mm OD and 23 mm width per ISO 15. SKF lists C 60.5 kN, C0 78 kN, Pu 9.15 kN, reference speed 4,300 r/min and limiting speed 5,300 r/min, mass about 400 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3009-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3009-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3009",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3009-CV",
      "SKF NCF 3009 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3010-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3010 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 76.5,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 11.8,
    "max_rpm": 5000,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 5000,
    "weight_g": 430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 3010 CV resolves to a 50×80×23 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.28 (98 against 76.5 kN), and the Pu figure 11.8 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,000 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Fit practice for NCF3010-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill table rollers",
      "slew and swing drives",
      "heavy gearbox output shafts",
      "crane travel-wheel bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 5,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 76.5/98 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3010-CV?",
        "a": "SKF NCF 3010 CV is a single-row full-complement cylindrical roller bearing with 50 mm bore, 80 mm OD and 23 mm width per ISO 15. SKF lists C 76.5 kN, C0 98 kN, Pu 11.8 kN, reference speed 4,000 r/min and limiting speed 5,000 r/min, mass about 430 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3010-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3010-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3010",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3010-CV",
      "SKF NCF 3010 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3011-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3011 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 105,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 17.3,
    "max_rpm": 4300,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4300,
    "weight_g": 640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF3011-CV is the 55 mm bore entry in the NCF3000 range: a 55×90×26 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 105 kN / C0 140 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 105 kN and C0 140 kN, size the bearing on the 55×90 mm ISO 15 envelope and check the 17.3 kN Pu against the equivalent-load floor; the catalogue lists 3,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "slew and swing drives",
      "heavy gearbox output shafts",
      "crane travel-wheel bearings",
      "rolling-mill table rollers"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 4,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "The 105/140 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3011-CV?",
        "a": "SKF NCF 3011 CV is a single-row full-complement cylindrical roller bearing with 55 mm bore, 90 mm OD and 26 mm width per ISO 15. SKF lists C 105 kN, C0 140 kN, Pu 17.3 kN, reference speed 3,400 r/min and limiting speed 4,300 r/min, mass about 640 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3011-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3011-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3011",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3011-CV",
      "SKF NCF 3011 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3012-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3012 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 95,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 106,
    "static_load_kN": 146,
    "fatigue_load_limit_kN": 18.3,
    "max_rpm": 4000,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4000,
    "weight_g": 690,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 60 mm shaft, SKF lists NCF3012-CV as single-row full-complement cylindrical roller: 95 mm OD, 26 mm wide, Pu 18.3 kN, the catalogue lists 3,400 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.38 (146 against 106 kN), and the Pu figure 18.3 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,400 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Fit practice for NCF3012-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 4,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 95 mm raceway.",
      "The 106/146 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3012-CV?",
        "a": "SKF NCF 3012 CV is a single-row full-complement cylindrical roller bearing with 60 mm bore, 95 mm OD and 26 mm width per ISO 15. SKF lists C 106 kN, C0 146 kN, Pu 18.3 kN, reference speed 3,400 r/min and limiting speed 4,000 r/min, mass about 690 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3012-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3012-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3012",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3012-CV",
      "SKF NCF 3012 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3013-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3013 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 100,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 112,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 20,
    "max_rpm": 3800,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3800,
    "weight_g": 730,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 3013 CV is a single-row full-complement cylindrical roller bearing sized 65×100×26 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 112 kN and C0 163 kN, size the bearing on the 65×100 mm ISO 15 envelope and check the 20 kN Pu against the equivalent-load floor; the catalogue lists 3,000 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 26 mm-wide ring and concentrates load.",
      "The 112/163 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3013-CV?",
        "a": "SKF NCF 3013 CV is a single-row full-complement cylindrical roller bearing with 65 mm bore, 100 mm OD and 26 mm width per ISO 15. SKF lists C 112 kN, C0 163 kN, Pu 20 kN, reference speed 3,000 r/min and limiting speed 3,800 r/min, mass about 730 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3013-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3013-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3013",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3013-CV",
      "SKF NCF 3013 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3014-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3014 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 110,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 128,
    "static_load_kN": 173,
    "fatigue_load_limit_kN": 22.4,
    "max_rpm": 7000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 7000,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3014 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 70×110×30 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 1000 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 70 mm seat is about 1.83 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 173 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 7,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 128/173 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3014-CV?",
        "a": "SKF NCF 3014 CV is a single-row full-complement cylindrical roller bearing with 70 mm bore, 110 mm OD and 30 mm width per ISO 15. SKF lists C 128 kN, C0 173 kN, Pu 22.4 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 1000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3014-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3014-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3014",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3014-CV",
      "SKF NCF 3014 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3015-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3015 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 115,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 134,
    "static_load_kN": 190,
    "fatigue_load_limit_kN": 24.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3200,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 3015 CV resolves to a 75×115×30 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 134 kN and C0 190 kN, size the bearing on the 75×115 mm ISO 15 envelope and check the 24.5 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 134/190 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3015-CV?",
        "a": "SKF NCF 3015 CV is a single-row full-complement cylindrical roller bearing with 75 mm bore, 115 mm OD and 30 mm width per ISO 15. SKF lists C 134 kN, C0 190 kN, Pu 24.5 kN, reference speed 2,600 r/min and limiting speed 3,200 r/min, mass about 1050 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3015-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3015-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3015",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3015-CV",
      "SKF NCF 3015 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3016-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3016 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 125,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 165,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 29,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF3016-CV is the 80 mm bore entry in the NCF3000 range: a 80×125×34 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 165 kN / C0 228 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 80 mm seat is about 2.06 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 228 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.",
      "The 165/228 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3016-CV?",
        "a": "SKF NCF 3016 CV is a single-row full-complement cylindrical roller bearing with 80 mm bore, 125 mm OD and 34 mm width per ISO 15. SKF lists C 165 kN, C0 228 kN, Pu 29 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 1450 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3016-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3016-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3016",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3016-CV",
      "SKF NCF 3016 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3017-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3017 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 130,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 172,
    "static_load_kN": 236,
    "fatigue_load_limit_kN": 30,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 1500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 85 mm shaft, SKF lists NCF3017-CV as single-row full-complement cylindrical roller: 130 mm OD, 34 mm wide, Pu 30 kN, the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 172 kN and C0 236 kN, size the bearing on the 85×130 mm ISO 15 envelope and check the 30 kN Pu against the equivalent-load floor; the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.",
      "The 172/236 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3017-CV?",
        "a": "SKF NCF 3017 CV is a single-row full-complement cylindrical roller bearing with 85 mm bore, 130 mm OD and 34 mm width per ISO 15. SKF lists C 172 kN, C0 236 kN, Pu 30 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 1500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3017-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3017-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3017",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3017-CV",
      "SKF NCF 3017 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3018-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3018 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 140,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 198,
    "static_load_kN": 280,
    "fatigue_load_limit_kN": 35.5,
    "max_rpm": 2800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2800,
    "weight_g": 1950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 3018 CV is a single-row full-complement cylindrical roller bearing sized 90×140×37 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 90 mm seat is about 2.20 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 280 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 37 mm-wide ring and concentrates load.",
      "The 198/280 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3018-CV?",
        "a": "SKF NCF 3018 CV is a single-row full-complement cylindrical roller bearing with 90 mm bore, 140 mm OD and 37 mm width per ISO 15. SKF lists C 198 kN, C0 280 kN, Pu 35.5 kN, reference speed 2,200 r/min and limiting speed 2,800 r/min, mass about 1950 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3018-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3018-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3018",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3018-CV",
      "SKF NCF 3018 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3020-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3020 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 150,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 209,
    "static_load_kN": 310,
    "fatigue_load_limit_kN": 37.5,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 3020 CV resolves to a 100×150×37 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 25.0 mm and the catalogue mass 2150 g; at 209 kN dynamic rating this is roughly 2.09 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 209/310 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3020-CV?",
        "a": "SKF NCF 3020 CV is a single-row full-complement cylindrical roller bearing with 100 mm bore, 150 mm OD and 37 mm width per ISO 15. SKF lists C 209 kN, C0 310 kN, Pu 37.5 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 2150 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3020-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3020-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3020",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3020-CV",
      "SKF NCF 3020 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3022-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3022 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 275,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 48,
    "max_rpm": 4500,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4500,
    "weight_g": 3500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 110 mm shaft, SKF lists NCF3022-CV as single-row full-complement cylindrical roller: 170 mm OD, 45 mm wide, Pu 48 kN, the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 30.0 mm and the catalogue mass 3500 g; at 275 kN dynamic rating this is roughly 2.50 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 4,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.",
      "The 275/400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3022-CV?",
        "a": "SKF NCF 3022 CV is a single-row full-complement cylindrical roller bearing with 110 mm bore, 170 mm OD and 45 mm width per ISO 15. SKF lists C 275 kN, C0 400 kN, Pu 48 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 3500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3022-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3022-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3022",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3022-CV",
      "SKF NCF 3022 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3024-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3024 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 292,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 52,
    "max_rpm": 2000,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2000,
    "weight_g": 3800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3024 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 120×180×46 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 3800 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.51 (440 against 292 kN), and the Pu figure 52 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,700 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Fit practice for NCF3024-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 292/440 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3024-CV?",
        "a": "SKF NCF 3024 CV is a single-row full-complement cylindrical roller bearing with 120 mm bore, 180 mm OD and 46 mm width per ISO 15. SKF lists C 292 kN, C0 440 kN, Pu 52 kN, reference speed 1,700 r/min and limiting speed 2,000 r/min, mass about 3800 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3024-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3024-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3024",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3024-CV",
      "SKF NCF 3024 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3026-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3026 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 413,
    "static_load_kN": 620,
    "fatigue_load_limit_kN": 72,
    "max_rpm": 1900,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1900,
    "weight_g": 5800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF3026-CV is the 130 mm bore entry in the NCF3000 range: a 130×200×52 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 413 kN / C0 620 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.50 (620 against 413 kN), and the Pu figure 72 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Fit practice for NCF3026-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "The 413/620 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3026-CV?",
        "a": "SKF NCF 3026 CV is a single-row full-complement cylindrical roller bearing with 130 mm bore, 200 mm OD and 52 mm width per ISO 15. SKF lists C 413 kN, C0 620 kN, Pu 72 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 5800 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3026-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3026-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3026",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3026-CV",
      "SKF NCF 3026 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3028-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3028 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 440,
    "static_load_kN": 680,
    "fatigue_load_limit_kN": 78,
    "max_rpm": 1800,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1800,
    "weight_g": 6100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 3028 CV is a single-row full-complement cylindrical roller bearing sized 140×210×53 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.55 (680 against 440 kN), and the Pu figure 78 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,400 r/min thermal reference speed and 1,800 r/min mechanical limiting speed. Fit practice for NCF3028-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 53 mm-wide ring and concentrates load.",
      "The 440/680 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3028-CV?",
        "a": "SKF NCF 3028 CV is a single-row full-complement cylindrical roller bearing with 140 mm bore, 210 mm OD and 53 mm width per ISO 15. SKF lists C 440 kN, C0 680 kN, Pu 78 kN, reference speed 1,400 r/min and limiting speed 1,800 r/min, mass about 6100 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3028-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3028-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3028",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3028-CV",
      "SKF NCF 3028 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3030-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3030 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 457,
    "static_load_kN": 710,
    "fatigue_load_limit_kN": 80,
    "max_rpm": 1700,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1700,
    "weight_g": 7500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF3030-CV is the 150 mm bore entry in the NCF3000 range: a 150×225×56 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 457 kN / C0 710 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 457 kN and C0 710 kN, size the bearing on the 150×225 mm ISO 15 envelope and check the 80 kN Pu against the equivalent-load floor; the catalogue lists 1,300 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Fit practice for NCF3030-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 457/710 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3030-CV?",
        "a": "SKF NCF 3030 CV is a single-row full-complement cylindrical roller bearing with 150 mm bore, 225 mm OD and 56 mm width per ISO 15. SKF lists C 457 kN, C0 710 kN, Pu 80 kN, reference speed 1,300 r/min and limiting speed 1,700 r/min, mass about 7500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3030-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3030-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3030",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3030-CV",
      "SKF NCF 3030 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3032-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3032 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 512,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 90,
    "max_rpm": 1500,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1500,
    "weight_g": 9100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 3032 CV is a single-row full-complement cylindrical roller bearing sized 160×240×60 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 512 kN and C0 800 kN, size the bearing on the 160×240 mm ISO 15 envelope and check the 90 kN Pu against the equivalent-load floor; the catalogue lists 1,200 r/min thermal reference speed and 1,500 r/min mechanical limiting speed. Fit practice for NCF3032-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 240 mm raceway.",
      "The 512/800 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3032-CV?",
        "a": "SKF NCF 3032 CV is a single-row full-complement cylindrical roller bearing with 160 mm bore, 240 mm OD and 60 mm width per ISO 15. SKF lists C 512 kN, C0 800 kN, Pu 90 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 9100 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3032-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3032-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3032-CV",
      "SKF NCF 3032 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3034-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3034 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 671,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 118,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 3034 CV resolves to a 170×260×67 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 45.0 mm and the catalogue mass 12500 g; at 671 kN dynamic rating this is roughly 3.95 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 67 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 671/1060 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3034-CV?",
        "a": "SKF NCF 3034 CV is a single-row full-complement cylindrical roller bearing with 170 mm bore, 260 mm OD and 67 mm width per ISO 15. SKF lists C 671 kN, C0 1060 kN, Pu 118 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 12500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3034-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3034-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3034",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3034-CV",
      "SKF NCF 3034 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3036-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3036 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 781,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 134,
    "max_rpm": 1300,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1300,
    "weight_g": 16500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 180 mm shaft, SKF lists NCF3036-CV as single-row full-complement cylindrical roller: 280 mm OD, 74 mm wide, Pu 134 kN, the catalogue lists 1,100 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 50.0 mm and the catalogue mass 16500 g; at 781 kN dynamic rating this is roughly 4.34 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 74 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.",
      "The 781/1250 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3036-CV?",
        "a": "SKF NCF 3036 CV is a single-row full-complement cylindrical roller bearing with 180 mm bore, 280 mm OD and 74 mm width per ISO 15. SKF lists C 781 kN, C0 1250 kN, Pu 134 kN, reference speed 1,100 r/min and limiting speed 1,300 r/min, mass about 16500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3036-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3036-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3036-CV",
      "SKF NCF 3036 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3038-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3038 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 792,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 140,
    "max_rpm": 1300,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1300,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3038 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 190×290×75 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 17000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 50.0 mm and the catalogue mass 17000 g; at 792 kN dynamic rating this is roughly 4.17 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 75 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 75 mm-wide ring and concentrates load.",
      "The 792/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3038-CV?",
        "a": "SKF NCF 3038 CV is a single-row full-complement cylindrical roller bearing with 190 mm bore, 290 mm OD and 75 mm width per ISO 15. SKF lists C 792 kN, C0 1290 kN, Pu 140 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 17000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3038-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3038-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3038",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3038-CV",
      "SKF NCF 3038 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3040-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3040 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 913,
    "static_load_kN": 1530,
    "fatigue_load_limit_kN": 160,
    "max_rpm": 1200,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1200,
    "weight_g": 22500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 200 mm shaft, SKF lists NCF3040-CV as single-row full-complement cylindrical roller: 310 mm OD, 82 mm wide, Pu 160 kN, the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 200 mm seat is about 4.57 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 1530 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 310 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 913/1530 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3040-CV?",
        "a": "SKF NCF 3040 CV is a single-row full-complement cylindrical roller bearing with 200 mm bore, 310 mm OD and 82 mm width per ISO 15. SKF lists C 913 kN, C0 1530 kN, Pu 160 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 22500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3040-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3040-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3040-CV",
      "SKF NCF 3040 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3044-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3044 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1800,
    "fatigue_load_limit_kN": 186,
    "max_rpm": 1100,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1100,
    "weight_g": 29500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 3044 CV resolves to a 220×340×90 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 1080 kN and C0 1800 kN, size the bearing on the 220×340 mm ISO 15 envelope and check the 186 kN Pu against the equivalent-load floor; the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Fit practice for NCF3044-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1080/1800 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3044-CV?",
        "a": "SKF NCF 3044 CV is a single-row full-complement cylindrical roller bearing with 220 mm bore, 340 mm OD and 90 mm width per ISO 15. SKF lists C 1080 kN, C0 1800 kN, Pu 186 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 29500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3044-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3044-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3044",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3044-CV",
      "SKF NCF 3044 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3048-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3048 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1960,
    "fatigue_load_limit_kN": 200,
    "max_rpm": 1000,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1000,
    "weight_g": 32000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3048 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 240×360×92 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 32000 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1140 kN and C0 1960 kN, size the bearing on the 240×360 mm ISO 15 envelope and check the 200 kN Pu against the equivalent-load floor; the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. Fit practice for NCF3048-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 92 mm-wide ring and concentrates load.",
      "The 1140/1960 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3048-CV?",
        "a": "SKF NCF 3048 CV is a single-row full-complement cylindrical roller bearing with 240 mm bore, 360 mm OD and 92 mm width per ISO 15. SKF lists C 1140 kN, C0 1960 kN, Pu 200 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 32000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3048-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3048-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3048-CV",
      "SKF NCF 3048 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3052-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3052 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1540,
    "static_load_kN": 2550,
    "fatigue_load_limit_kN": 250,
    "max_rpm": 900,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 900,
    "weight_g": 46500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3052 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 260×400×104 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 46500 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.66 (2550 against 1540 kN), and the Pu figure 250 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. Fit practice for NCF3052-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 104 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.",
      "The 1540/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3052-CV?",
        "a": "SKF NCF 3052 CV is a single-row full-complement cylindrical roller bearing with 260 mm bore, 400 mm OD and 104 mm width per ISO 15. SKF lists C 1540 kN, C0 2550 kN, Pu 250 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 46500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3052-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3052-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3052",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3052-CV",
      "SKF NCF 3052 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3056-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3056 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1570,
    "static_load_kN": 2650,
    "fatigue_load_limit_kN": 260,
    "max_rpm": 850,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 850,
    "weight_g": 50000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 3056 CV is a single-row full-complement cylindrical roller bearing sized 280×420×106 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3056-CV: the catalogue lists 670 r/min thermal reference speed and 850 r/min mechanical limiting speed. The mass entry 50000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 280 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 850 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "The 1570/2650 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3056-CV?",
        "a": "SKF NCF 3056 CV is a single-row full-complement cylindrical roller bearing with 280 mm bore, 420 mm OD and 106 mm width per ISO 15. SKF lists C 1570 kN, C0 2650 kN, Pu 260 kN, reference speed 670 r/min and limiting speed 850 r/min, mass about 50000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3056-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3056-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3056-CV",
      "SKF NCF 3056 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3060-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3060 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1900,
    "static_load_kN": 3250,
    "fatigue_load_limit_kN": 300,
    "max_rpm": 750,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 750,
    "weight_g": 65500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 3060 CV is a single-row full-complement cylindrical roller bearing sized 300×460×118 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 80.0 mm and the catalogue mass 65500 g; at 1900 kN dynamic rating this is roughly 6.33 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 300 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 750 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1900/3250 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3060-CV?",
        "a": "SKF NCF 3060 CV is a single-row full-complement cylindrical roller bearing with 300 mm bore, 460 mm OD and 118 mm width per ISO 15. SKF lists C 1900 kN, C0 3250 kN, Pu 300 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 65500 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3060-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3060-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3060",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3060-CV",
      "SKF NCF 3060 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3064-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3064 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1980,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 310,
    "max_rpm": 700,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 700,
    "weight_g": 71000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 320 mm shaft, SKF lists NCF3064-CV as single-row full-complement cylindrical roller: 480 mm OD, 121 mm wide, Pu 310 kN, the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.74 (3450 against 1980 kN), and the Pu figure 310 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1980/3450 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3064-CV?",
        "a": "SKF NCF 3064 CV is a single-row full-complement cylindrical roller bearing with 320 mm bore, 480 mm OD and 121 mm width per ISO 15. SKF lists C 1980 kN, C0 3450 kN, Pu 310 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 71000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3064-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3064-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3064",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3064-CV",
      "SKF NCF 3064 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3068-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3068 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2380,
    "static_load_kN": 4150,
    "fatigue_load_limit_kN": 355,
    "max_rpm": 670,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 670,
    "weight_g": 95000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF3068-CV is the 340 mm bore entry in the NCF3000 range: a 340×520×133 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2380 kN / C0 4150 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.74 (4150 against 2380 kN), and the Pu figure 355 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 670 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 133 mm-wide ring and concentrates load.",
      "The 2380/4150 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3068-CV?",
        "a": "SKF NCF 3068 CV is a single-row full-complement cylindrical roller bearing with 340 mm bore, 520 mm OD and 133 mm width per ISO 15. SKF lists C 2380 kN, C0 4150 kN, Pu 355 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 95000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3068-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3068-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3068-CV",
      "SKF NCF 3068 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3072-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3072 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2420,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 365,
    "max_rpm": 630,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 630,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 3072 CV resolves to a 360×540×134 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 2420 kN and C0 4300 kN, size the bearing on the 360×540 mm ISO 15 envelope and check the 365 kN Pu against the equivalent-load floor; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Fit practice for NCF3072-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 630 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.",
      "The 2420/4300 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3072-CV?",
        "a": "SKF NCF 3072 CV is a single-row full-complement cylindrical roller bearing with 360 mm bore, 540 mm OD and 134 mm width per ISO 15. SKF lists C 2420 kN, C0 4300 kN, Pu 365 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 105000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3072-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3072-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3072-CV",
      "SKF NCF 3072 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3076-V",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3076 V",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2700,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 425,
    "max_rpm": 600,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 600,
    "weight_g": 110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 380 mm shaft, SKF lists NCF3076-V as single-row full-complement cylindrical roller: 560 mm OD, 135 mm wide, Pu 425 kN, the catalogue lists 480 r/min thermal reference speed and 600 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 90.0 mm and the catalogue mass 110000 g; at 2700 kN dynamic rating this is roughly 7.11 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 380 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 560 mm raceway.",
      "The 2700/5100 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3076-V?",
        "a": "SKF NCF 3076 V is a single-row full-complement cylindrical roller bearing with 380 mm bore, 560 mm OD and 135 mm width per ISO 15. SKF lists C 2700 kN, C0 5100 kN, Pu 425 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 110000 g."
      },
      {
        "q": "What does the NCF designation and V suffix mean?",
        "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3076-V take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3076-V compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3076",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3076-V",
      "SKF NCF 3076 V"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3080-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3080 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2970,
    "static_load_kN": 5500,
    "fatigue_load_limit_kN": 450,
    "max_rpm": 560,
    "reference_speed_rpm": 450,
    "limiting_speed_rpm": 560,
    "weight_g": 145000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3080 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 400×600×148 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 145000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3080-CV: the catalogue lists 450 r/min thermal reference speed and 560 r/min mechanical limiting speed. The mass entry 145000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 560 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 148 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 2970/5500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3080-CV?",
        "a": "SKF NCF 3080 CV is a single-row full-complement cylindrical roller bearing with 400 mm bore, 600 mm OD and 148 mm width per ISO 15. SKF lists C 2970 kN, C0 5500 kN, Pu 450 kN, reference speed 450 r/min and limiting speed 560 r/min, mass about 145000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3080-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3080-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3080",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3080-CV",
      "SKF NCF 3080 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3084-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3084 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3030,
    "static_load_kN": 5700,
    "fatigue_load_limit_kN": 455,
    "max_rpm": 530,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 530,
    "weight_g": 150000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NCF 3084 CV is a single-row full-complement cylindrical roller bearing sized 420×620×150 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 3030 kN and C0 5700 kN, size the bearing on the 420×620 mm ISO 15 envelope and check the 455 kN Pu against the equivalent-load floor; the catalogue lists 430 r/min thermal reference speed and 530 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 530 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 150 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 3030/5700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3084-CV?",
        "a": "SKF NCF 3084 CV is a single-row full-complement cylindrical roller bearing with 420 mm bore, 620 mm OD and 150 mm width per ISO 15. SKF lists C 3030 kN, C0 5700 kN, Pu 455 kN, reference speed 430 r/min and limiting speed 530 r/min, mass about 150000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3084-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3084-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3084-CV",
      "SKF NCF 3084 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3092-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3092 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3690,
    "static_load_kN": 6950,
    "fatigue_load_limit_kN": 540,
    "max_rpm": 480,
    "reference_speed_rpm": 380,
    "limiting_speed_rpm": 480,
    "weight_g": 195000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NCF3092-CV is the 460 mm bore entry in the NCF3000 range: a 460×680×163 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 3690 kN / C0 6950 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF3092-CV: the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. The mass entry 195000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 460 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 480 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 163 mm-wide ring and concentrates load.",
      "The 3690/6950 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3092-CV?",
        "a": "SKF NCF 3092 CV is a single-row full-complement cylindrical roller bearing with 460 mm bore, 680 mm OD and 163 mm width per ISO 15. SKF lists C 3690 kN, C0 6950 kN, Pu 540 kN, reference speed 380 r/min and limiting speed 480 r/min, mass about 195000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3092-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3092-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3092-CV",
      "SKF NCF 3092 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NCF3096-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NCF 3096 CV",
    "series": "NCF3000-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3740,
    "static_load_kN": 7200,
    "fatigue_load_limit_kN": 550,
    "max_rpm": 450,
    "reference_speed_rpm": 360,
    "limiting_speed_rpm": 450,
    "weight_g": 205000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NCF 3096 CV resolves to a 480×700×165 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3096-CV: the catalogue lists 360 r/min thermal reference speed and 450 r/min mechanical limiting speed. The mass entry 205000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 480 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 700 mm raceway.",
      "The 3740/7200 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NCF3096-CV?",
        "a": "SKF NCF 3096 CV is a single-row full-complement cylindrical roller bearing with 480 mm bore, 700 mm OD and 165 mm width per ISO 15. SKF lists C 3740 kN, C0 7200 kN, Pu 550 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 205000 g."
      },
      {
        "q": "What does the NCF designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together."
      },
      {
        "q": "Can NCF3096-CV take axial load and locate the shaft?",
        "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded."
      },
      {
        "q": "How does NCF3096-CV compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NCF3096",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NCF3096-CV",
      "SKF NCF 3096 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1009-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1009 ECP",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 75,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 44.6,
    "static_load_kN": 52,
    "fatigue_load_limit_kN": 6.3,
    "max_rpm": 11000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 11000,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1009-ECP is the 45 mm bore entry in the NJ1000 range: a 45×75×16 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 44.6 kN / C0 52 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 45 mm seat is about 0.99 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 52 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 45 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1009, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1009 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.",
      "The 44.6/52 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1009-ECP?",
        "a": "SKF NJ 1009 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 75 mm OD and 16 mm width per ISO 15. SKF lists C 44.6 kN, C0 52 kN, Pu 6.3 kN, reference speed 11,000 r/min and limiting speed 11,000 r/min, mass about 260 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1009-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1009-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1009",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×75×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1009-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×75×16 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1009-ECP",
      "SKF NJ 1009 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1011-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1011 ECP",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 90,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 57.2,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 8.3,
    "max_rpm": 8500,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 8500,
    "weight_g": 420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 1011 ECP resolves to a 55×90×18 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.22 (69.5 against 57.2 kN), and the Pu figure 8.3 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 8,500 r/min thermal reference speed and 8,500 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1011, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1011 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "The 57.2/69.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1011-ECP?",
        "a": "SKF NJ 1011 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 90 mm OD and 18 mm width per ISO 15. SKF lists C 57.2 kN, C0 69.5 kN, Pu 8.3 kN, reference speed 8,500 r/min and limiting speed 8,500 r/min, mass about 420 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1011-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1011-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1011",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×90×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1011-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×90×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1011-ECP",
      "SKF NJ 1011 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1016-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1016 ECML",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 125,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 99,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 16.3,
    "max_rpm": 9500,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 9500,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 80 mm shaft, SKF lists NJ1016-ECML as single-row caged cylindrical roller: 125 mm OD, 22 mm wide, Pu 16.3 kN, the catalogue lists 6,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 99 kN and C0 127 kN, size the bearing on the 80×125 mm ISO 15 envelope and check the 16.3 kN Pu against the equivalent-load floor; the catalogue lists 6,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1016, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1016 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.",
      "The 99/127 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1016-ECML?",
        "a": "SKF NJ 1016 ECML is a single-row caged cylindrical roller bearing with 80 mm bore, 125 mm OD and 22 mm width per ISO 15. SKF lists C 99 kN, C0 127 kN, Pu 16.3 kN, reference speed 6,000 r/min and limiting speed 9,500 r/min, mass about 1050 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1016-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1016-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1016",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×125×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1016",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same ISO 15 envelope 80×125×22 mm, but catalogue C/C0 ratings differ between executions (99/127 vs 64.4/78 kN) and the NU flange/ring configuration differs — envelope match, not a load-rating equivalent."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1016-ECML",
      "SKF NJ 1016 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1017-ML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1017 ML",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 130,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 68.2,
    "static_load_kN": 86.5,
    "fatigue_load_limit_kN": 10.8,
    "max_rpm": 9000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 9000,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 1017 ML denotes a single-row caged cylindrical roller bearing on the ISO 15 85×130×22 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 1100 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. With C 68.2 kN and C0 86.5 kN, size the bearing on the 85×130 mm ISO 15 envelope and check the 10.8 kN Pu against the equivalent-load floor; the catalogue lists 6,000 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1017, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1017 ML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 68.2/86.5 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1017-ML?",
        "a": "SKF NJ 1017 ML is a single-row caged cylindrical roller bearing with 85 mm bore, 130 mm OD and 22 mm width per ISO 15. SKF lists C 68.2 kN, C0 86.5 kN, Pu 10.8 kN, reference speed 6,000 r/min and limiting speed 9,000 r/min, mass about 1100 g."
      },
      {
        "q": "What does the NJ designation and ML suffix mean?",
        "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1017-ML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1017-ML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1017",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×130×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1017-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×130×22 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP1017-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×130×22 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1017-ML",
      "SKF NJ 1017 ML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1018-ML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1018 ML",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 140,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 80.9,
    "static_load_kN": 104,
    "fatigue_load_limit_kN": 12.7,
    "max_rpm": 8500,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 8500,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 1018 ML resolves to a 90×140×24 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Load-per-bore for the 90 mm seat is about 0.90 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 104 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1018, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1018 ML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.",
      "The 80.9/104 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1018-ML?",
        "a": "SKF NJ 1018 ML is a single-row caged cylindrical roller bearing with 90 mm bore, 140 mm OD and 24 mm width per ISO 15. SKF lists C 80.9 kN, C0 104 kN, Pu 12.7 kN, reference speed 5,600 r/min and limiting speed 8,500 r/min, mass about 1400 g."
      },
      {
        "q": "What does the NJ designation and ML suffix mean?",
        "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1018-ML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1018-ML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1018",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×140×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1018-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×140×24 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1018-ML",
      "SKF NJ 1018 ML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1026-ML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1026 ML",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 165,
    "static_load_kN": 224,
    "fatigue_load_limit_kN": 25,
    "max_rpm": 5600,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 5600,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 1026 ML is a single-row caged cylindrical roller bearing sized 130×200×33 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 35.0 mm and the catalogue mass 3900 g; at 165 kN dynamic rating this is roughly 1.27 kN of C per millimetre of bore before application factors. Fit practice for NJ1026-ML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1026, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1026 ML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 165/224 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1026-ML?",
        "a": "SKF NJ 1026 ML is a single-row caged cylindrical roller bearing with 130 mm bore, 200 mm OD and 33 mm width per ISO 15. SKF lists C 165 kN, C0 224 kN, Pu 25 kN, reference speed 3,800 r/min and limiting speed 5,600 r/min, mass about 3900 g."
      },
      {
        "q": "What does the NJ designation and ML suffix mean?",
        "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1026-ML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1026-ML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1026",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×200×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1026-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×200×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1026-ML",
      "SKF NJ 1026 ML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1034-ML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1034 ML",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 275,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 41.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 4300,
    "weight_g": 8200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 170 mm shaft, SKF lists NJ1034-ML as single-row caged cylindrical roller: 260 mm OD, 42 mm wide, Pu 41.5 kN, the catalogue lists 2,800 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 275 kN and C0 400 kN, size the bearing on the 170×260 mm ISO 15 envelope and check the 41.5 kN Pu against the equivalent-load floor; the catalogue lists 2,800 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1034, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1034 ML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 42 mm-wide ring and concentrates load.",
      "The 275/400 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1034-ML?",
        "a": "SKF NJ 1034 ML is a single-row caged cylindrical roller bearing with 170 mm bore, 260 mm OD and 42 mm width per ISO 15. SKF lists C 275 kN, C0 400 kN, Pu 41.5 kN, reference speed 2,800 r/min and limiting speed 4,300 r/min, mass about 8200 g."
      },
      {
        "q": "What does the NJ designation and ML suffix mean?",
        "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1034-ML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1034-ML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1034",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1034-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×260×42 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1034-ML",
      "SKF NJ 1034 ML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1036-ML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1036 ML",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 336,
    "static_load_kN": 475,
    "fatigue_load_limit_kN": 51,
    "max_rpm": 4000,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 4000,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 1036 ML denotes a single-row caged cylindrical roller bearing on the ISO 15 180×280×46 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 10500 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. With C 336 kN and C0 475 kN, size the bearing on the 180×280 mm ISO 15 envelope and check the 51 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1036, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1036 ML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 336/475 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1036-ML?",
        "a": "SKF NJ 1036 ML is a single-row caged cylindrical roller bearing with 180 mm bore, 280 mm OD and 46 mm width per ISO 15. SKF lists C 336 kN, C0 475 kN, Pu 51 kN, reference speed 2,600 r/min and limiting speed 4,000 r/min, mass about 10500 g."
      },
      {
        "q": "What does the NJ designation and ML suffix mean?",
        "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1036-ML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1036-ML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1036",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1036-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×280×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1036-ML",
      "SKF NJ 1036 ML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1038-ML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1038 ML",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 347,
    "static_load_kN": 500,
    "fatigue_load_limit_kN": 53,
    "max_rpm": 3800,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3800,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1038-ML is the 190 mm bore entry in the NJ1000 range: a 190×290×46 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 347 kN / C0 500 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. With C 347 kN and C0 500 kN, size the bearing on the 190×290 mm ISO 15 envelope and check the 53 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1038, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1038 ML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.",
      "The 347/500 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1038-ML?",
        "a": "SKF NJ 1038 ML is a single-row caged cylindrical roller bearing with 190 mm bore, 290 mm OD and 46 mm width per ISO 15. SKF lists C 347 kN, C0 500 kN, Pu 53 kN, reference speed 2,600 r/min and limiting speed 3,800 r/min, mass about 11000 g."
      },
      {
        "q": "What does the NJ designation and ML suffix mean?",
        "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1038-ML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1038-ML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1038",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1038-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×290×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1038-ML",
      "SKF NJ 1038 ML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1044-ML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1044 ML",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 495,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 73.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3200,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 1044 ML is a single-row caged cylindrical roller bearing sized 220×340×56 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. Speed planning for NJ1044-ML: the catalogue lists 2,200 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. The mass entry 18500 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1044, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1044 ML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.",
      "The 495/735 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1044-ML?",
        "a": "SKF NJ 1044 ML is a single-row caged cylindrical roller bearing with 220 mm bore, 340 mm OD and 56 mm width per ISO 15. SKF lists C 495 kN, C0 735 kN, Pu 73.5 kN, reference speed 2,200 r/min and limiting speed 3,200 r/min, mass about 18500 g."
      },
      {
        "q": "What does the NJ designation and ML suffix mean?",
        "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1044-ML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1044-ML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1044",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×340×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1044-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×340×56 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1044-ML",
      "SKF NJ 1044 ML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1052-ML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1052 ML",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 627,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 96.5,
    "max_rpm": 2800,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2800,
    "weight_g": 30000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1052-ML is the 260 mm bore entry in the NJ1000 range: a 260×400×65 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 627 kN / C0 965 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.54 (965 against 627 kN), and the Pu figure 96.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,800 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Fit practice for NJ1052-ML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1052, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1052 ML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 627/965 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1052-ML?",
        "a": "SKF NJ 1052 ML is a single-row caged cylindrical roller bearing with 260 mm bore, 400 mm OD and 65 mm width per ISO 15. SKF lists C 627 kN, C0 965 kN, Pu 96.5 kN, reference speed 1,800 r/min and limiting speed 2,800 r/min, mass about 30000 g."
      },
      {
        "q": "What does the NJ designation and ML suffix mean?",
        "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1052-ML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1052-ML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1052",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 260×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU1052-ML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 260×400×65 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1052-ML",
      "SKF NJ 1052 ML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1060-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1060 MA",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 858,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 129,
    "max_rpm": 2000,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2000,
    "weight_g": 46000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 300 mm shaft, SKF lists NJ1060-MA as single-row caged cylindrical roller: 460 mm OD, 74 mm wide, Pu 129 kN, the catalogue lists 1,500 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 80.0 mm and the catalogue mass 46000 g; at 858 kN dynamic rating this is roughly 2.86 kN of C per millimetre of bore before application factors. Fit practice for NJ1060-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1060, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1060 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 74 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 858/1370 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1060-MA?",
        "a": "SKF NJ 1060 MA is a single-row caged cylindrical roller bearing with 300 mm bore, 460 mm OD and 74 mm width per ISO 15. SKF lists C 858 kN, C0 1370 kN, Pu 129 kN, reference speed 1,500 r/min and limiting speed 2,000 r/min, mass about 46000 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1060-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1060-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1060",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU1060-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 300×460×74 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1060-MA",
      "SKF NJ 1060 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1064-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1064 MA",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 880,
    "static_load_kN": 1430,
    "fatigue_load_limit_kN": 132,
    "max_rpm": 1400,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1400,
    "weight_g": 48000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1064-MA is the 320 mm bore entry in the NJ1000 range: a 320×480×74 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 880 kN / C0 1430 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 1.63 (1430 against 880 kN), and the Pu figure 132 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,400 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 320 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1064, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1064 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 74 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 880/1430 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1064-MA?",
        "a": "SKF NJ 1064 MA is a single-row caged cylindrical roller bearing with 320 mm bore, 480 mm OD and 74 mm width per ISO 15. SKF lists C 880 kN, C0 1430 kN, Pu 132 kN, reference speed 1,400 r/min and limiting speed 1,400 r/min, mass about 48000 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1064-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1064-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1064",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU1064-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 320×480×74 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1064-MA",
      "SKF NJ 1064 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1076-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1076 MA",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1930,
    "fatigue_load_limit_kN": 170,
    "max_rpm": 1600,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1600,
    "weight_g": 71000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 1076 MA is a single-row caged cylindrical roller bearing sized 380×560×82 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. The radial section height is 90.0 mm and the catalogue mass 71000 g; at 1140 kN dynamic rating this is roughly 3.00 kN of C per millimetre of bore before application factors. Fit practice for NJ1076-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1076, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1076 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 560 mm raceway.",
      "The 1140/1930 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1076-MA?",
        "a": "SKF NJ 1076 MA is a single-row caged cylindrical roller bearing with 380 mm bore, 560 mm OD and 82 mm width per ISO 15. SKF lists C 1140 kN, C0 1930 kN, Pu 170 kN, reference speed 1,200 r/min and limiting speed 1,600 r/min, mass about 71000 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1076-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1076-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1076",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU1076-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 380×560×82 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1076-MA",
      "SKF NJ 1076 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1080-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1080 MA",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1380,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 196,
    "max_rpm": 1500,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1500,
    "weight_g": 93000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 1080 MA is a single-row caged cylindrical roller bearing sized 400×600×90 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 400 mm seat is about 3.45 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 2320 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ1080-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1080, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1080 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 90 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1380/2320 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1080-MA?",
        "a": "SKF NJ 1080 MA is a single-row caged cylindrical roller bearing with 400 mm bore, 600 mm OD and 90 mm width per ISO 15. SKF lists C 1380 kN, C0 2320 kN, Pu 196 kN, reference speed 1,100 r/min and limiting speed 1,500 r/min, mass about 93000 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1080-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1080-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1080",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU1080-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 400×600×90 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1080-MA",
      "SKF NJ 1080 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ18-630-ECMA-HB1",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 18/630 ECMA/HB1",
    "series": "NJ1800-series",
    "type": "cylindrical_roller",
    "d_mm": 630,
    "D_mm": 780,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1100,
    "static_load_kN": 2500,
    "fatigue_load_limit_kN": 183,
    "max_rpm": 950,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 950,
    "weight_g": 75000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 630 mm shaft, SKF lists NJ18-630-ECMA-HB1 as single-row caged cylindrical roller: 780 mm OD, 69 mm wide, Pu 183 kN, the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NJ18-630-ECMA-HB1: the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. The mass entry 75000 g covers the complete catalogue execution. Fit practice for NJ18-630-ECMA-HB1: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 18/630, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 18/630 ECMA/HB1 and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 780 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1100/2500 kN ratings are SKF catalogue 17000 (2018) values for the ECMA/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ18-630-ECMA-HB1?",
        "a": "SKF NJ 18/630 ECMA/HB1 is a single-row caged cylindrical roller bearing with 630 mm bore, 780 mm OD and 69 mm width per ISO 15. SKF lists C 1100 kN, C0 2500 kN, Pu 183 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 75000 g."
      },
      {
        "q": "What does the NJ designation and ECMA/HB1 suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ18-630-ECMA-HB1 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ18-630-ECMA-HB1 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ18",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ18-630-ECMA-HB1",
      "SKF NJ 18/630 ECMA/HB1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1876-ECMP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1876 ECMP",
    "series": "NJ1800-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 480,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 561,
    "static_load_kN": 1120,
    "fatigue_load_limit_kN": 98,
    "max_rpm": 2000,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2000,
    "weight_g": 21000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 1876 ECMP denotes a single-row caged cylindrical roller bearing on the ISO 15 380×480×46 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 21000 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECMP suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Speed planning for NJ1876-ECMP: the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The mass entry 21000 g covers the complete catalogue execution. Fit practice for NJ1876-ECMP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1876, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1876 ECMP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.",
      "The 561/1120 kN ratings are SKF catalogue 17000 (2018) values for the ECMP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1876-ECMP?",
        "a": "SKF NJ 1876 ECMP is a single-row caged cylindrical roller bearing with 380 mm bore, 480 mm OD and 46 mm width per ISO 15. SKF lists C 561 kN, C0 1120 kN, Pu 98 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 21000 g."
      },
      {
        "q": "What does the NJ designation and ECMP suffix mean?",
        "a": "The ECMP suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1876-ECMP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1876-ECMP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1876-ECMP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 380×480×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1876-ECMP",
      "SKF NJ 1876 ECMP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1880-MP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 1880 MP",
    "series": "NJ1800-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 500,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 572,
    "static_load_kN": 1180,
    "fatigue_load_limit_kN": 96.5,
    "max_rpm": 1900,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1900,
    "weight_g": 22000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 1880 MP is a single-row caged cylindrical roller bearing sized 400×500×46 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MP suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 50.0 mm and the catalogue mass 22000 g; at 572 kN dynamic rating this is roughly 1.43 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1880, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1880 MP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.",
      "The 572/1180 kN ratings are SKF catalogue 17000 (2018) values for the MP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1880-MP?",
        "a": "SKF NJ 1880 MP is a single-row caged cylindrical roller bearing with 400 mm bore, 500 mm OD and 46 mm width per ISO 15. SKF lists C 572 kN, C0 1180 kN, Pu 96.5 kN, reference speed 1,300 r/min and limiting speed 1,900 r/min, mass about 22000 g."
      },
      {
        "q": "What does the NJ designation and MP suffix mean?",
        "a": "The MP suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ1880-MP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ1880-MP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1880-MP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 400×500×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP1880-MP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 400×500×46 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ1880-MP",
      "SKF NJ 1880 MP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ202-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 202 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 15,
    "D_mm": 35,
    "B_mm": 11,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 12.5,
    "static_load_kN": 10.2,
    "fatigue_load_limit_kN": 1.22,
    "max_rpm": 26000,
    "reference_speed_rpm": 22000,
    "limiting_speed_rpm": 26000,
    "weight_g": 48,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 202 ECP resolves to a 15×35×11 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 15 mm seat is about 0.83 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 10.2 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ202-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "small pump rotor shafts",
      "small industrial electric-motor shafts",
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 202, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 202 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 35 mm raceway.",
      "The 12.5/10.2 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ202-ECP?",
        "a": "SKF NJ 202 ECP is a single-row caged cylindrical roller bearing with 15 mm bore, 35 mm OD and 11 mm width per ISO 15. SKF lists C 12.5 kN, C0 10.2 kN, Pu 1.22 kN, reference speed 22,000 r/min and limiting speed 26,000 r/min, mass about 48 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ202-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ202-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU202-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 15×35×11 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ202-ECP",
      "SKF NJ 202 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ203-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 203 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 12,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 20,
    "static_load_kN": 14.3,
    "fatigue_load_limit_kN": 1.73,
    "max_rpm": 22000,
    "reference_speed_rpm": 20000,
    "limiting_speed_rpm": 22000,
    "weight_g": 69,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 203 ECP resolves to a 17×40×12 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.72 (14.3 against 20 kN), and the Pu figure 1.73 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 20,000 r/min thermal reference speed and 22,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "small industrial electric-motor shafts",
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 203, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 203 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 40 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 40 mm raceway.",
      "The 20/14.3 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ203-ECP?",
        "a": "SKF NJ 203 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 40 mm OD and 12 mm width per ISO 15. SKF lists C 20 kN, C0 14.3 kN, Pu 1.73 kN, reference speed 20,000 r/min and limiting speed 22,000 r/min, mass about 69 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ203-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ203-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N203-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU203-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP203-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ203-ECP",
      "SKF NJ 203 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ204-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 204 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 28.5,
    "static_load_kN": 22,
    "fatigue_load_limit_kN": 2.75,
    "max_rpm": 19000,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 19000,
    "weight_g": 110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ204-ECP is the 20 mm bore entry in the NJ200 range: a 20×47×14 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 28.5 kN / C0 22 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 13.5 mm and the catalogue mass 110 g; at 28.5 kN dynamic rating this is roughly 1.43 kN of C per millimetre of bore before application factors. Fit practice for NJ204-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts",
      "small pump rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 204, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 204 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 14 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 47 mm raceway.",
      "The 28.5/22 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ204-ECP?",
        "a": "SKF NJ 204 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 47 mm OD and 14 mm width per ISO 15. SKF lists C 28.5 kN, C0 22 kN, Pu 2.75 kN, reference speed 17,000 r/min and limiting speed 19,000 r/min, mass about 110 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ204-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ204-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N204-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP204-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU204",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ204-ECP",
      "SKF NJ 204 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ205-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 205 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 32.5,
    "static_load_kN": 27,
    "fatigue_load_limit_kN": 3.35,
    "max_rpm": 16000,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 16000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ205-ECP is the 25 mm bore entry in the NJ200 range: a 25×52×15 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 32.5 kN / C0 27 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. With C 32.5 kN and C0 27 kN, size the bearing on the 25×52 mm ISO 15 envelope and check the 3.35 kN Pu against the equivalent-load floor; the catalogue lists 15,000 r/min thermal reference speed and 16,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts",
      "small pump rotor shafts",
      "small industrial electric-motor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 205, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 205 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 52 mm raceway.",
      "The 32.5/27 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ205-ECP?",
        "a": "SKF NJ 205 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 52 mm OD and 15 mm width per ISO 15. SKF lists C 32.5 kN, C0 27 kN, Pu 3.35 kN, reference speed 15,000 r/min and limiting speed 16,000 r/min, mass about 140 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ205-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ205-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ205-ECP",
      "SKF NJ 205 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ206-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 206 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 44,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 4.55,
    "max_rpm": 14000,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 14000,
    "weight_g": 210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 30 mm shaft, SKF lists NJ206-ECP as single-row caged cylindrical roller: 62 mm OD, 16 mm wide, Pu 4.55 kN, the catalogue lists 13,000 r/min thermal reference speed and 14,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ206-ECP: the catalogue lists 13,000 r/min thermal reference speed and 14,000 r/min mechanical limiting speed. The mass entry 210 g covers the complete catalogue execution. Fit practice for NJ206-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 206, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 206 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.",
      "The 44/36.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ206-ECP?",
        "a": "SKF NJ 206 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 62 mm OD and 16 mm width per ISO 15. SKF lists C 44 kN, C0 36.5 kN, Pu 4.55 kN, reference speed 13,000 r/min and limiting speed 14,000 r/min, mass about 210 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ206-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ206-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ206-ECP",
      "SKF NJ 206 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ207-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 207 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 56,
    "static_load_kN": 48,
    "fatigue_load_limit_kN": 6.1,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 207 ECP is a single-row caged cylindrical roller bearing sized 35×72×17 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 35 mm seat is about 1.60 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 48 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 35 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 207, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 207 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 17 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.",
      "The 56/48 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ207-ECP?",
        "a": "SKF NJ 207 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 72 mm OD and 17 mm width per ISO 15. SKF lists C 56 kN, C0 48 kN, Pu 6.1 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 300 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ207-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ207-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ207-ECP",
      "SKF NJ 207 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ208-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 208 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 62,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 6.7,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 380,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 208 ECP is a single-row caged cylindrical roller bearing sized 40×80×18 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 20.0 mm and the catalogue mass 380 g; at 62 kN dynamic rating this is roughly 1.55 kN of C per millimetre of bore before application factors. Fit practice for NJ208-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 208, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 208 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.",
      "The 62/53 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ208-ECP?",
        "a": "SKF NJ 208 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 80 mm OD and 18 mm width per ISO 15. SKF lists C 62 kN, C0 53 kN, Pu 6.7 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 380 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ208-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ208-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ208",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ208-ECP",
      "SKF NJ 208 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ209-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 209 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 64,
    "fatigue_load_limit_kN": 8.15,
    "max_rpm": 9500,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 9500,
    "weight_g": 440,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 209 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 45×85×19 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 440 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 69.5 kN and C0 64 kN, size the bearing on the 45×85 mm ISO 15 envelope and check the 8.15 kN Pu against the equivalent-load floor; the catalogue lists 9,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 45 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 209, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 209 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 85 mm raceway.",
      "The 69.5/64 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ209-ECP?",
        "a": "SKF NJ 209 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 85 mm OD and 19 mm width per ISO 15. SKF lists C 69.5 kN, C0 64 kN, Pu 8.15 kN, reference speed 9,000 r/min and limiting speed 9,500 r/min, mass about 440 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ209-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ209-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ209",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ209-ECP",
      "SKF NJ 209 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ210-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 210 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 73.5,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 8.8,
    "max_rpm": 9000,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 9000,
    "weight_g": 490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 50 mm shaft, SKF lists NJ210-ECP as single-row caged cylindrical roller: 90 mm OD, 20 mm wide, Pu 8.8 kN, the catalogue lists 8,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ210-ECP: the catalogue lists 8,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. The mass entry 490 g covers the complete catalogue execution. Fit practice for NJ210-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 210, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 210 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.",
      "The 73.5/69.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ210-ECP?",
        "a": "SKF NJ 210 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 90 mm OD and 20 mm width per ISO 15. SKF lists C 73.5 kN, C0 69.5 kN, Pu 8.8 kN, reference speed 8,500 r/min and limiting speed 9,000 r/min, mass about 490 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ210-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ210-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ210",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ210-ECP",
      "SKF NJ 210 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ211-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 211 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 96.5,
    "static_load_kN": 95,
    "fatigue_load_limit_kN": 12.2,
    "max_rpm": 8000,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8000,
    "weight_g": 670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 211 ECP is a single-row caged cylindrical roller bearing sized 55×100×21 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 55 mm seat is about 1.75 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 95 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 55 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 211, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 211 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.",
      "The 96.5/95 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ211-ECP?",
        "a": "SKF NJ 211 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 100 mm OD and 21 mm width per ISO 15. SKF lists C 96.5 kN, C0 95 kN, Pu 12.2 kN, reference speed 7,500 r/min and limiting speed 8,000 r/min, mass about 670 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ211-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ211-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ211",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU211",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ211-ECP",
      "SKF NJ 211 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ212-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 212 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 22,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 108,
    "static_load_kN": 102,
    "fatigue_load_limit_kN": 13.4,
    "max_rpm": 7500,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 7500,
    "weight_g": 820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 212 ECP is a single-row caged cylindrical roller bearing sized 60×110×22 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 60 mm seat is about 1.80 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 102 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 212, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 212 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 108/102 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ212-ECP?",
        "a": "SKF NJ 212 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 110 mm OD and 22 mm width per ISO 15. SKF lists C 108 kN, C0 102 kN, Pu 13.4 kN, reference speed 6,700 r/min and limiting speed 7,500 r/min, mass about 820 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ212-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ212-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ212",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ212-ECP",
      "SKF NJ 212 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ213-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 213 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 122,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 15.6,
    "max_rpm": 6700,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6700,
    "weight_g": 1050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 213 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 65×120×23 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 1050 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.97 (118 against 122 kN), and the Pu figure 15.6 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,300 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 213, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 213 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 122/118 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ213-ECP?",
        "a": "SKF NJ 213 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 120 mm OD and 23 mm width per ISO 15. SKF lists C 122 kN, C0 118 kN, Pu 15.6 kN, reference speed 6,300 r/min and limiting speed 6,700 r/min, mass about 1050 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ213-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ213-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ213",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N213-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP213-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU213",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ213-ECP",
      "SKF NJ 213 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ214-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 214 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 137,
    "static_load_kN": 137,
    "fatigue_load_limit_kN": 18,
    "max_rpm": 6300,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "weight_g": 1200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 214 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 70×125×24 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 1200 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 27.5 mm and the catalogue mass 1200 g; at 137 kN dynamic rating this is roughly 1.96 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 214, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 214 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 24 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 137/137 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ214-ECP?",
        "a": "SKF NJ 214 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 125 mm OD and 24 mm width per ISO 15. SKF lists C 137 kN, C0 137 kN, Pu 18 kN, reference speed 6,000 r/min and limiting speed 6,300 r/min, mass about 1200 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ214-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ214-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ214",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N214-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP214-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU214",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ214-ECP",
      "SKF NJ 214 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ215-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 215 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 150,
    "static_load_kN": 156,
    "fatigue_load_limit_kN": 20.4,
    "max_rpm": 6000,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6000,
    "weight_g": 1300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 215 ECP resolves to a 75×130×25 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ215-ECP: the catalogue lists 5,600 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The mass entry 1300 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 215, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 215 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 150/156 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ215-ECP?",
        "a": "SKF NJ 215 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 130 mm OD and 25 mm width per ISO 15. SKF lists C 150 kN, C0 156 kN, Pu 20.4 kN, reference speed 5,600 r/min and limiting speed 6,000 r/min, mass about 1300 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ215-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ215-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ215",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N215-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP215-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU215",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ215-ECP",
      "SKF NJ 215 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ216-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 216 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 26,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 160,
    "static_load_kN": 166,
    "fatigue_load_limit_kN": 21.2,
    "max_rpm": 5600,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5600,
    "weight_g": 1550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ216-ECP is the 80 mm bore entry in the NJ200 range: a 80×140×26 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 160 kN / C0 166 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 80 mm seat is about 2.00 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 166 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ216-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 216, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 216 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 26 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 160/166 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ216-ECP?",
        "a": "SKF NJ 216 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 140 mm OD and 26 mm width per ISO 15. SKF lists C 160 kN, C0 166 kN, Pu 21.2 kN, reference speed 5,300 r/min and limiting speed 5,600 r/min, mass about 1550 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ216-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ216-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ216",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N216-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP216-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU216",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ216-ECP",
      "SKF NJ 216 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ217-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 217 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 190,
    "static_load_kN": 200,
    "fatigue_load_limit_kN": 25,
    "max_rpm": 5300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5300,
    "weight_g": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ217-ECP is the 85 mm bore entry in the NJ200 range: a 85×150×28 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 190 kN / C0 200 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.05 (200 against 190 kN), and the Pu figure 25 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,800 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 217, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 217 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 190/200 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ217-ECP?",
        "a": "SKF NJ 217 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 150 mm OD and 28 mm width per ISO 15. SKF lists C 190 kN, C0 200 kN, Pu 25 kN, reference speed 4,800 r/min and limiting speed 5,300 r/min, mass about 1900 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ217-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ217-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ217",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N217-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP217-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU217",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ217-ECP",
      "SKF NJ 217 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ218-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 218 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 208,
    "static_load_kN": 220,
    "fatigue_load_limit_kN": 27,
    "max_rpm": 5000,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 5000,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 90 mm shaft, SKF lists NJ218-ECP as single-row caged cylindrical roller: 160 mm OD, 30 mm wide, Pu 27 kN, the catalogue lists 4,500 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 35.0 mm and the catalogue mass 2300 g; at 208 kN dynamic rating this is roughly 2.31 kN of C per millimetre of bore before application factors. Fit practice for NJ218-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 218, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 218 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 208/220 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ218-ECP?",
        "a": "SKF NJ 218 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 160 mm OD and 30 mm width per ISO 15. SKF lists C 208 kN, C0 220 kN, Pu 27 kN, reference speed 4,500 r/min and limiting speed 5,000 r/min, mass about 2300 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ218-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ218-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ218",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N218-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP218-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU218",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ218-ECP",
      "SKF NJ 218 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ219-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 219 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 32,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 255,
    "static_load_kN": 265,
    "fatigue_load_limit_kN": 32.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4800,
    "weight_g": 2900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 95 mm shaft, SKF lists NJ219-ECP as single-row caged cylindrical roller: 170 mm OD, 32 mm wide, Pu 32.5 kN, the catalogue lists 4,300 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 255 kN and C0 265 kN, size the bearing on the 95×170 mm ISO 15 envelope and check the 32.5 kN Pu against the equivalent-load floor; the catalogue lists 4,300 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 219, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 219 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 32 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 255/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ219-ECP?",
        "a": "SKF NJ 219 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 170 mm OD and 32 mm width per ISO 15. SKF lists C 255 kN, C0 265 kN, Pu 32.5 kN, reference speed 4,300 r/min and limiting speed 4,800 r/min, mass about 2900 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ219-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ219-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ219",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N219-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP219-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU219",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ219-ECP",
      "SKF NJ 219 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ220-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 220 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 34,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 285,
    "static_load_kN": 305,
    "fatigue_load_limit_kN": 36.5,
    "max_rpm": 4500,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4500,
    "weight_g": 3450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ220-ECP is the 100 mm bore entry in the NJ200 range: a 100×180×34 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 285 kN / C0 305 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ220-ECP: the catalogue lists 4,000 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 3450 g covers the complete catalogue execution. Fit practice for NJ220-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 220, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 220 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "The 285/305 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ220-ECP?",
        "a": "SKF NJ 220 ECP is a single-row caged cylindrical roller bearing with 100 mm bore, 180 mm OD and 34 mm width per ISO 15. SKF lists C 285 kN, C0 305 kN, Pu 36.5 kN, reference speed 4,000 r/min and limiting speed 4,500 r/min, mass about 3450 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ220-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ220-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ220",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N220-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP220-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU220",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ220-ECP",
      "SKF NJ 220 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2203-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2203 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 17,
    "D_mm": 40,
    "B_mm": 16,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 27.5,
    "static_load_kN": 21.6,
    "fatigue_load_limit_kN": 2.65,
    "max_rpm": 22000,
    "reference_speed_rpm": 20000,
    "limiting_speed_rpm": 22000,
    "weight_g": 93,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 17 mm shaft, SKF lists NJ2203-ECP as single-row caged cylindrical roller: 40 mm OD, 16 mm wide, Pu 2.65 kN, the catalogue lists 20,000 r/min thermal reference speed and 22,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 11.5 mm and the catalogue mass 93 g; at 27.5 kN dynamic rating this is roughly 1.62 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts",
      "small pump rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2203, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2203 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 40 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.",
      "The 27.5/21.6 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2203-ECP?",
        "a": "SKF NJ 2203 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 40 mm OD and 16 mm width per ISO 15. SKF lists C 27.5 kN, C0 21.6 kN, Pu 2.65 kN, reference speed 20,000 r/min and limiting speed 22,000 r/min, mass about 93 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2203-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2203-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2203-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×40×16 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2203-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×40×16 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2203-ECP",
      "SKF NJ 2203 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2204-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2204 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 20,
    "D_mm": 47,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 34.5,
    "static_load_kN": 27.5,
    "fatigue_load_limit_kN": 3.45,
    "max_rpm": 19000,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 19000,
    "weight_g": 140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2204 ECP is a single-row caged cylindrical roller bearing sized 20×47×18 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 34.5 kN and C0 27.5 kN, size the bearing on the 20×47 mm ISO 15 envelope and check the 3.45 kN Pu against the equivalent-load floor; the catalogue lists 17,000 r/min thermal reference speed and 19,000 r/min mechanical limiting speed. Fit practice for NJ2204-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts",
      "small pump rotor shafts",
      "small industrial electric-motor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2204, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2204 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.",
      "The 34.5/27.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2204-ECP?",
        "a": "SKF NJ 2204 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 47 mm OD and 18 mm width per ISO 15. SKF lists C 34.5 kN, C0 27.5 kN, Pu 3.45 kN, reference speed 17,000 r/min and limiting speed 19,000 r/min, mass about 140 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2204-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2204-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2204-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×47×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2204-ECP",
      "SKF NJ 2204 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2205-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2205 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 39,
    "static_load_kN": 34,
    "fatigue_load_limit_kN": 4.25,
    "max_rpm": 16000,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 16000,
    "weight_g": 170,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2205 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 25×52×18 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 170 g. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ2205-ECP: the catalogue lists 15,000 r/min thermal reference speed and 16,000 r/min mechanical limiting speed. The mass entry 170 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 25 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "appliance and fan armature shafts",
      "small pump rotor shafts",
      "small industrial electric-motor shafts",
      "light gearbox layshafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2205, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2205 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.",
      "The 39/34 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2205-ECP?",
        "a": "SKF NJ 2205 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 52 mm OD and 18 mm width per ISO 15. SKF lists C 39 kN, C0 34 kN, Pu 4.25 kN, reference speed 15,000 r/min and limiting speed 16,000 r/min, mass about 170 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2205-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2205-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2205-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×52×18 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2205",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×52×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2205-ECP",
      "SKF NJ 2205 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2206-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2206 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 55,
    "static_load_kN": 49,
    "fatigue_load_limit_kN": 6.1,
    "max_rpm": 14000,
    "reference_speed_rpm": 13000,
    "limiting_speed_rpm": 14000,
    "weight_g": 260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2206 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 30×62×20 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 260 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 30 mm seat is about 1.83 kN/mm, typical of dimension series 22 (light-section, wide); use C0 49 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2206-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2206, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2206 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.",
      "The 55/49 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2206-ECP?",
        "a": "SKF NJ 2206 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 62 mm OD and 20 mm width per ISO 15. SKF lists C 55 kN, C0 49 kN, Pu 6.1 kN, reference speed 13,000 r/min and limiting speed 14,000 r/min, mass about 260 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2206-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2206-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2206-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×62×20 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2206",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×62×20 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2206-ECP",
      "SKF NJ 2206 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2207-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2207 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 69.5,
    "static_load_kN": 63,
    "fatigue_load_limit_kN": 8.15,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 410,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2207 ECP resolves to a 35×72×23 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.91 (63 against 69.5 kN), and the Pu figure 8.15 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 11,000 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 35 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2207, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2207 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "The 69.5/63 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2207-ECP?",
        "a": "SKF NJ 2207 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 72 mm OD and 23 mm width per ISO 15. SKF lists C 69.5 kN, C0 63 kN, Pu 8.15 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 410 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2207-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2207-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2207-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×72×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2207",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×72×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2207-ECP",
      "SKF NJ 2207 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2208-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2208 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 81.5,
    "static_load_kN": 75,
    "fatigue_load_limit_kN": 9.65,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2208 ECP resolves to a 40×80×23 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 81.5 kN and C0 75 kN, size the bearing on the 40×80 mm ISO 15 envelope and check the 9.65 kN Pu against the equivalent-load floor; the catalogue lists 9,500 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. Fit practice for NJ2208-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2208, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2208 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "The 81.5/75 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2208-ECP?",
        "a": "SKF NJ 2208 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 80 mm OD and 23 mm width per ISO 15. SKF lists C 81.5 kN, C0 75 kN, Pu 9.65 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 500 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2208-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2208-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2208",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2208-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×80×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2208",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×80×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2208-ECP",
      "SKF NJ 2208 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2209-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2209 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 85,
    "static_load_kN": 81.5,
    "fatigue_load_limit_kN": 10.6,
    "max_rpm": 9500,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 9500,
    "weight_g": 540,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2209-ECP is the 45 mm bore entry in the NJ2200 range: a 45×85×23 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 85 kN / C0 81.5 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ2209-ECP: the catalogue lists 9,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The mass entry 540 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 45 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2209, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2209 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "The 85/81.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2209-ECP?",
        "a": "SKF NJ 2209 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 85 mm OD and 23 mm width per ISO 15. SKF lists C 85 kN, C0 81.5 kN, Pu 10.6 kN, reference speed 9,000 r/min and limiting speed 9,500 r/min, mass about 540 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2209-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2209-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2209",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2209-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×85×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2209",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×85×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2209-ECP",
      "SKF NJ 2209 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ221-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 221 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 105,
    "D_mm": 190,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 300,
    "static_load_kN": 315,
    "fatigue_load_limit_kN": 36.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4300,
    "weight_g": 4000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ221-ECP is the 105 mm bore entry in the NJ200 range: a 105×190×36 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 300 kN / C0 315 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.05 (315 against 300 kN), and the Pu figure 36.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,800 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 221, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 221 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.",
      "The 300/315 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ221-ECP?",
        "a": "SKF NJ 221 ECP is a single-row caged cylindrical roller bearing with 105 mm bore, 190 mm OD and 36 mm width per ISO 15. SKF lists C 300 kN, C0 315 kN, Pu 36.5 kN, reference speed 3,800 r/min and limiting speed 4,300 r/min, mass about 4000 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ221-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ221-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ221",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×190×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N221-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU221-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP221-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ221-ECP",
      "SKF NJ 221 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2210-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2210 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 90,
    "static_load_kN": 88,
    "fatigue_load_limit_kN": 11.4,
    "max_rpm": 9000,
    "reference_speed_rpm": 8500,
    "limiting_speed_rpm": 9000,
    "weight_g": 570,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2210 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 50×90×23 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 570 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2210-ECP: the catalogue lists 8,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. The mass entry 570 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 50 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2210, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2210 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "The 90/88 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2210-ECP?",
        "a": "SKF NJ 2210 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 90 mm OD and 23 mm width per ISO 15. SKF lists C 90 kN, C0 88 kN, Pu 11.4 kN, reference speed 8,500 r/min and limiting speed 9,000 r/min, mass about 570 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2210-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2210-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2210",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2210-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×90×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2210",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×90×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2210-ECP",
      "SKF NJ 2210 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2211-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2211 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 114,
    "static_load_kN": 118,
    "fatigue_load_limit_kN": 15.3,
    "max_rpm": 8000,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8000,
    "weight_g": 810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2211 ECP resolves to a 55×100×25 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 55 mm seat is about 2.07 kN/mm, typical of dimension series 22 (light-section, wide); use C0 118 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2211, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2211 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "The 114/118 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2211-ECP?",
        "a": "SKF NJ 2211 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 114 kN, C0 118 kN, Pu 15.3 kN, reference speed 7,500 r/min and limiting speed 8,000 r/min, mass about 810 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2211-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2211-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2211",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2211-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×100×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2211",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×100×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2211-ECP",
      "SKF NJ 2211 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2212-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2212 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 146,
    "static_load_kN": 153,
    "fatigue_load_limit_kN": 20,
    "max_rpm": 7500,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 7500,
    "weight_g": 1100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2212 ECP resolves to a 60×110×28 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.05 (153 against 146 kN), and the Pu figure 20 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,700 r/min thermal reference speed and 7,500 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2212, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2212 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.",
      "The 146/153 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2212-ECP?",
        "a": "SKF NJ 2212 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 110 mm OD and 28 mm width per ISO 15. SKF lists C 146 kN, C0 153 kN, Pu 20 kN, reference speed 6,700 r/min and limiting speed 7,500 r/min, mass about 1100 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2212-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2212-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2212",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2212-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×110×28 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2212",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×110×28 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2212-ECP",
      "SKF NJ 2212 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2213-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2213 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 170,
    "static_load_kN": 180,
    "fatigue_load_limit_kN": 24,
    "max_rpm": 6700,
    "reference_speed_rpm": 6300,
    "limiting_speed_rpm": 6700,
    "weight_g": 1450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2213-ECP is the 65 mm bore entry in the NJ2200 range: a 65×120×31 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 170 kN / C0 180 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 27.5 mm and the catalogue mass 1450 g; at 170 kN dynamic rating this is roughly 2.62 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2213, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2213 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.",
      "The 170/180 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2213-ECP?",
        "a": "SKF NJ 2213 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 120 mm OD and 31 mm width per ISO 15. SKF lists C 170 kN, C0 180 kN, Pu 24 kN, reference speed 6,300 r/min and limiting speed 6,700 r/min, mass about 1450 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2213-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2213-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2213",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×120×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2213-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×120×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2213-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×120×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2213-ECP",
      "SKF NJ 2213 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2214-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2214 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 180,
    "static_load_kN": 193,
    "fatigue_load_limit_kN": 25.5,
    "max_rpm": 6300,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 6300,
    "weight_g": 1500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 70 mm shaft, SKF lists NJ2214-ECP as single-row caged cylindrical roller: 125 mm OD, 31 mm wide, Pu 25.5 kN, the catalogue lists 6,000 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 180 kN and C0 193 kN, size the bearing on the 70×125 mm ISO 15 envelope and check the 25.5 kN Pu against the equivalent-load floor; the catalogue lists 6,000 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. Fit practice for NJ2214-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2214, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2214 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 31 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.",
      "The 180/193 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2214-ECP?",
        "a": "SKF NJ 2214 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 125 mm OD and 31 mm width per ISO 15. SKF lists C 180 kN, C0 193 kN, Pu 25.5 kN, reference speed 6,000 r/min and limiting speed 6,300 r/min, mass about 1500 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2214-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2214-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2214",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×125×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2214-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×125×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2214-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×125×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2214-ECP",
      "SKF NJ 2214 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2215-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2215 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 186,
    "static_load_kN": 208,
    "fatigue_load_limit_kN": 27,
    "max_rpm": 6000,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6000,
    "weight_g": 1600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 75 mm shaft, SKF lists NJ2215-ECP as single-row caged cylindrical roller: 130 mm OD, 31 mm wide, Pu 27 kN, the catalogue lists 5,600 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 75 mm seat is about 2.48 kN/mm, typical of dimension series 22 (light-section, wide); use C0 208 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2215, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2215 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.",
      "The 186/208 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2215-ECP?",
        "a": "SKF NJ 2215 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 130 mm OD and 31 mm width per ISO 15. SKF lists C 186 kN, C0 208 kN, Pu 27 kN, reference speed 5,600 r/min and limiting speed 6,000 r/min, mass about 1600 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2215-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2215-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2215",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2215-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×130×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2215-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×130×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2215-ECP",
      "SKF NJ 2215 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2216-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2216 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 212,
    "static_load_kN": 245,
    "fatigue_load_limit_kN": 31,
    "max_rpm": 5600,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 5600,
    "weight_g": 2050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2216 ECP is a single-row caged cylindrical roller bearing sized 80×140×33 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.16 (245 against 212 kN), and the Pu figure 31 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 5,300 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Fit practice for NJ2216-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2216, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2216 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 33 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.",
      "The 212/245 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2216-ECP?",
        "a": "SKF NJ 2216 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 140 mm OD and 33 mm width per ISO 15. SKF lists C 212 kN, C0 245 kN, Pu 31 kN, reference speed 5,300 r/min and limiting speed 5,600 r/min, mass about 2050 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2216-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2216-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2216",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2216-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×140×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2216-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×140×33 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2216-ECP",
      "SKF NJ 2216 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2217-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2217 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 250,
    "static_load_kN": 280,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 5300,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5300,
    "weight_g": 2550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2217 ECP is a single-row caged cylindrical roller bearing sized 85×150×36 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 32.5 mm and the catalogue mass 2550 g; at 250 kN dynamic rating this is roughly 2.94 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2217, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2217 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.",
      "The 250/280 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2217-ECP?",
        "a": "SKF NJ 2217 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 150 mm OD and 36 mm width per ISO 15. SKF lists C 250 kN, C0 280 kN, Pu 34.5 kN, reference speed 4,800 r/min and limiting speed 5,300 r/min, mass about 2550 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2217-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2217-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2217",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×150×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2217-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×150×36 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2217-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×150×36 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2217-ECP",
      "SKF NJ 2217 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2218-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2218 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 280,
    "static_load_kN": 315,
    "fatigue_load_limit_kN": 39,
    "max_rpm": 5000,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 5000,
    "weight_g": 3250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2218 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 90×160×40 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 3250 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 280 kN and C0 315 kN, size the bearing on the 90×160 mm ISO 15 envelope and check the 39 kN Pu against the equivalent-load floor; the catalogue lists 4,500 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Fit practice for NJ2218-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2218, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2218 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.",
      "The 280/315 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2218-ECP?",
        "a": "SKF NJ 2218 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 160 mm OD and 40 mm width per ISO 15. SKF lists C 280 kN, C0 315 kN, Pu 39 kN, reference speed 4,500 r/min and limiting speed 5,000 r/min, mass about 3250 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2218-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2218-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2218",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×160×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2218-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×160×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2218-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×160×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2218-ECP",
      "SKF NJ 2218 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2219-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2219 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 325,
    "static_load_kN": 375,
    "fatigue_load_limit_kN": 45.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 4800,
    "weight_g": 3950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2219 ECP resolves to a 95×170×43 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2219-ECP: the catalogue lists 4,300 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 3950 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 95 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2219, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2219 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.",
      "The 325/375 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2219-ECP?",
        "a": "SKF NJ 2219 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 170 mm OD and 43 mm width per ISO 15. SKF lists C 325 kN, C0 375 kN, Pu 45.5 kN, reference speed 4,300 r/min and limiting speed 4,800 r/min, mass about 3950 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2219-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2219-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2219",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×170×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2219-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×170×43 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2219-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×170×43 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2219-ECP",
      "SKF NJ 2219 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ222-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 222 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 335,
    "static_load_kN": 365,
    "fatigue_load_limit_kN": 42.5,
    "max_rpm": 4000,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4000,
    "weight_g": 4800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 110 mm shaft, SKF lists NJ222-ECP as single-row caged cylindrical roller: 200 mm OD, 38 mm wide, Pu 42.5 kN, the catalogue lists 3,600 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 45.0 mm and the catalogue mass 4800 g; at 335 kN dynamic rating this is roughly 3.05 kN of C per millimetre of bore before application factors. Fit practice for NJ222-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 222, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 222 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "The 335/365 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ222-ECP?",
        "a": "SKF NJ 222 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 200 mm OD and 38 mm width per ISO 15. SKF lists C 335 kN, C0 365 kN, Pu 42.5 kN, reference speed 3,600 r/min and limiting speed 4,000 r/min, mass about 4800 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ222-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ222-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ222",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N222-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU222-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP222-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ222-ECP",
      "SKF NJ 222 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2220-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2220 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 380,
    "static_load_kN": 450,
    "fatigue_load_limit_kN": 54,
    "max_rpm": 4500,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4500,
    "weight_g": 4800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2220 ECP is a single-row caged cylindrical roller bearing sized 100×180×46 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 100 mm seat is about 3.80 kN/mm, typical of dimension series 22 (light-section, wide); use C0 450 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2220-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2220, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2220 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.",
      "The 380/450 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2220-ECP?",
        "a": "SKF NJ 2220 ECP is a single-row caged cylindrical roller bearing with 100 mm bore, 180 mm OD and 46 mm width per ISO 15. SKF lists C 380 kN, C0 450 kN, Pu 54 kN, reference speed 4,000 r/min and limiting speed 4,500 r/min, mass about 4800 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2220-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2220-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2220",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×180×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2220-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×180×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2220-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×180×46 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2220-ECP",
      "SKF NJ 2220 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2222-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2222 ECP",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 440,
    "static_load_kN": 520,
    "fatigue_load_limit_kN": 61,
    "max_rpm": 4000,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4000,
    "weight_g": 6700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2222 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 110×200×53 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 6700 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 440 kN and C0 520 kN, size the bearing on the 110×200 mm ISO 15 envelope and check the 61 kN Pu against the equivalent-load floor; the catalogue lists 3,600 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Fit practice for NJ2222-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2222, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2222 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 53 mm-wide ring and concentrates load.",
      "The 440/520 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2222-ECP?",
        "a": "SKF NJ 2222 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 200 mm OD and 53 mm width per ISO 15. SKF lists C 440 kN, C0 520 kN, Pu 61 kN, reference speed 3,600 r/min and limiting speed 4,000 r/min, mass about 6700 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2222-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2222-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2222",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×200×53 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2222-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×200×53 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2222-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×200×53 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2222-ECP",
      "SKF NJ 2222 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2224-ECJ",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2224 ECJ",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 520,
    "static_load_kN": 630,
    "fatigue_load_limit_kN": 72,
    "max_rpm": 3600,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3600,
    "weight_g": 8650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 120 mm shaft, SKF lists NJ2224-ECJ as single-row caged cylindrical roller: 215 mm OD, 58 mm wide, Pu 72 kN, the catalogue lists 3,400 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Load-per-bore for the 120 mm seat is about 4.33 kN/mm, typical of dimension series 22 (light-section, wide); use C0 630 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2224-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2224, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2224 ECJ and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.",
      "The 520/630 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2224-ECJ?",
        "a": "SKF NJ 2224 ECJ is a single-row caged cylindrical roller bearing with 120 mm bore, 215 mm OD and 58 mm width per ISO 15. SKF lists C 520 kN, C0 630 kN, Pu 72 kN, reference speed 3,400 r/min and limiting speed 3,600 r/min, mass about 8650 g."
      },
      {
        "q": "What does the NJ designation and ECJ suffix mean?",
        "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2224-ECJ take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2224-ECJ compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2224",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2224-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×215×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2224-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×215×58 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2224-ECJ",
      "SKF NJ 2224 ECJ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2226-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2226 ECML",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 610,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 83,
    "max_rpm": 5300,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 5300,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 130 mm shaft, SKF lists NJ2226-ECML as single-row caged cylindrical roller: 230 mm OD, 64 mm wide, Pu 83 kN, the catalogue lists 3,200 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. With C 610 kN and C0 735 kN, size the bearing on the 130×230 mm ISO 15 envelope and check the 83 kN Pu against the equivalent-load floor; the catalogue lists 3,200 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2226, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2226 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.",
      "The 610/735 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2226-ECML?",
        "a": "SKF NJ 2226 ECML is a single-row caged cylindrical roller bearing with 130 mm bore, 230 mm OD and 64 mm width per ISO 15. SKF lists C 610 kN, C0 735 kN, Pu 83 kN, reference speed 3,200 r/min and limiting speed 5,300 r/min, mass about 12000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2226-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2226-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2226",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2226-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×230×64 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2226-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×230×64 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2226-ECML",
      "SKF NJ 2226 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2228-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2228 ECML",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 655,
    "static_load_kN": 830,
    "fatigue_load_limit_kN": 93,
    "max_rpm": 4800,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 4800,
    "weight_g": 15500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2228 ECML resolves to a 140×250×68 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Load-per-bore for the 140 mm seat is about 4.68 kN/mm, typical of dimension series 22 (light-section, wide); use C0 830 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2228-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2228, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2228 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 68 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.",
      "The 655/830 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2228-ECML?",
        "a": "SKF NJ 2228 ECML is a single-row caged cylindrical roller bearing with 140 mm bore, 250 mm OD and 68 mm width per ISO 15. SKF lists C 655 kN, C0 830 kN, Pu 93 kN, reference speed 2,800 r/min and limiting speed 4,800 r/min, mass about 15500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2228-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2228-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2228",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2228-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×250×68 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2228-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×250×68 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2228-ECML",
      "SKF NJ 2228 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2230-ECM",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2230 ECM",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 735,
    "static_load_kN": 930,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 2800,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 2800,
    "weight_g": 19000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2230 ECM is a single-row caged cylindrical roller bearing sized 150×270×73 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECM: the E-design ECM execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.27 (930 against 735 kN), and the Pu figure 100 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,600 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Fit practice for NJ2230-ECM: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2230, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2230 ECM and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 73 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.",
      "The 735/930 kN ratings are SKF catalogue 17000 (2018) values for the ECM execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2230-ECM?",
        "a": "SKF NJ 2230 ECM is a single-row caged cylindrical roller bearing with 150 mm bore, 270 mm OD and 73 mm width per ISO 15. SKF lists C 735 kN, C0 930 kN, Pu 100 kN, reference speed 2,600 r/min and limiting speed 2,800 r/min, mass about 19000 g."
      },
      {
        "q": "What does the NJ designation and ECM suffix mean?",
        "a": "The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2230-ECM take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2230-ECM compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2230",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×270×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2230-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×270×73 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2230-ECM",
      "SKF NJ 2230 ECM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2232-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2232 ECML",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 930,
    "static_load_kN": 1200,
    "fatigue_load_limit_kN": 129,
    "max_rpm": 4000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4000,
    "weight_g": 23500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2232-ECML is the 160 mm bore entry in the NJ2200 range: a 160×290×80 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 930 kN / C0 1200 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.29 (1200 against 930 kN), and the Pu figure 129 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,400 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2232, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2232 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "The 930/1200 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2232-ECML?",
        "a": "SKF NJ 2232 ECML is a single-row caged cylindrical roller bearing with 160 mm bore, 290 mm OD and 80 mm width per ISO 15. SKF lists C 930 kN, C0 1200 kN, Pu 129 kN, reference speed 2,400 r/min and limiting speed 4,000 r/min, mass about 23500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2232-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2232-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2232",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×290×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2232-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×290×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2232-ECML",
      "SKF NJ 2232 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2234-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2234 ECML",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 140,
    "max_rpm": 3800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3800,
    "weight_g": 29000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2234 ECML denotes a single-row caged cylindrical roller bearing on the ISO 15 170×310×86 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 29000 g. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 1060 kN and C0 1340 kN, size the bearing on the 170×310 mm ISO 15 envelope and check the 140 kN Pu against the equivalent-load floor; the catalogue lists 2,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2234, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2234 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 86 mm-wide ring and concentrates load.",
      "The 1060/1340 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2234-ECML?",
        "a": "SKF NJ 2234 ECML is a single-row caged cylindrical roller bearing with 170 mm bore, 310 mm OD and 86 mm width per ISO 15. SKF lists C 1060 kN, C0 1340 kN, Pu 140 kN, reference speed 2,200 r/min and limiting speed 3,800 r/min, mass about 29000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2234-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2234-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2234",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×310×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2234-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×310×86 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2234-ECML",
      "SKF NJ 2234 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2236-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2236 ECML",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1100,
    "static_load_kN": 1430,
    "fatigue_load_limit_kN": 146,
    "max_rpm": 3600,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3600,
    "weight_g": 30000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2236-ECML is the 180 mm bore entry in the NJ2200 range: a 180×320×86 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1100 kN / C0 1430 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 180 mm seat is about 6.11 kN/mm, typical of dimension series 22 (light-section, wide); use C0 1430 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2236, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2236 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 86 mm-wide ring and concentrates load.",
      "The 1100/1430 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2236-ECML?",
        "a": "SKF NJ 2236 ECML is a single-row caged cylindrical roller bearing with 180 mm bore, 320 mm OD and 86 mm width per ISO 15. SKF lists C 1100 kN, C0 1430 kN, Pu 146 kN, reference speed 2,200 r/min and limiting speed 3,600 r/min, mass about 30000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2236-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2236-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2236",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×320×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2236-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×320×86 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2236-ECML",
      "SKF NJ 2236 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2238-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2238 ECML",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 160,
    "max_rpm": 3400,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 3400,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2238 ECML is a single-row caged cylindrical roller bearing sized 190×340×92 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.31 (1600 against 1220 kN), and the Pu figure 160 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2238, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2238 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 92 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1220/1600 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2238-ECML?",
        "a": "SKF NJ 2238 ECML is a single-row caged cylindrical roller bearing with 190 mm bore, 340 mm OD and 92 mm width per ISO 15. SKF lists C 1220 kN, C0 1600 kN, Pu 160 kN, reference speed 2,000 r/min and limiting speed 3,400 r/min, mass about 37000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2238-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2238-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2238",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×340×92 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2238-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×340×92 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2238-ECML",
      "SKF NJ 2238 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ224-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 224 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 390,
    "static_load_kN": 430,
    "fatigue_load_limit_kN": 49,
    "max_rpm": 3600,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 3600,
    "weight_g": 5850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 224 ECP is a single-row caged cylindrical roller bearing sized 120×215×40 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ224-ECP: the catalogue lists 3,400 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 5850 g covers the complete catalogue execution. Fit practice for NJ224-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 224, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 224 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.",
      "The 390/430 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ224-ECP?",
        "a": "SKF NJ 224 ECP is a single-row caged cylindrical roller bearing with 120 mm bore, 215 mm OD and 40 mm width per ISO 15. SKF lists C 390 kN, C0 430 kN, Pu 49 kN, reference speed 3,400 r/min and limiting speed 3,600 r/min, mass about 5850 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ224-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ224-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ224",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N224-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU224-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP224-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ224-ECP",
      "SKF NJ 224 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2240-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2240 ECML",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1370,
    "static_load_kN": 1800,
    "fatigue_load_limit_kN": 180,
    "max_rpm": 3200,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 3200,
    "weight_g": 44000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2240 ECML is a single-row caged cylindrical roller bearing sized 200×360×98 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.31 (1800 against 1370 kN), and the Pu figure 180 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,900 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2240, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2240 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1370/1800 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2240-ECML?",
        "a": "SKF NJ 2240 ECML is a single-row caged cylindrical roller bearing with 200 mm bore, 360 mm OD and 98 mm width per ISO 15. SKF lists C 1370 kN, C0 1800 kN, Pu 180 kN, reference speed 1,900 r/min and limiting speed 3,200 r/min, mass about 44000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2240-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2240-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2240",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×360×98 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2240-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×360×98 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2240-ECML",
      "SKF NJ 2240 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2244-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2244 ECML",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1570,
    "static_load_kN": 2280,
    "fatigue_load_limit_kN": 212,
    "max_rpm": 3000,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 3000,
    "weight_g": 60000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 220 mm shaft, SKF lists NJ2244-ECML as single-row caged cylindrical roller: 400 mm OD, 108 mm wide, Pu 212 kN, the catalogue lists 1,600 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Load-per-bore for the 220 mm seat is about 7.14 kN/mm, typical of dimension series 22 (light-section, wide); use C0 2280 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2244, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2244 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1570/2280 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2244-ECML?",
        "a": "SKF NJ 2244 ECML is a single-row caged cylindrical roller bearing with 220 mm bore, 400 mm OD and 108 mm width per ISO 15. SKF lists C 1570 kN, C0 2280 kN, Pu 212 kN, reference speed 1,600 r/min and limiting speed 3,000 r/min, mass about 60000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2244-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2244-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2244",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×400×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2244-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×400×108 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2244-ECML",
      "SKF NJ 2244 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2248-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2248 MA",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1450,
    "static_load_kN": 2360,
    "fatigue_load_limit_kN": 224,
    "max_rpm": 2200,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 2200,
    "weight_g": 86000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2248 MA resolves to a 240×440×120 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 100.0 mm and the catalogue mass 86000 g; at 1450 kN dynamic rating this is roughly 6.04 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2248, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2248 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.",
      "The 1450/2360 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2248-MA?",
        "a": "SKF NJ 2248 MA is a single-row caged cylindrical roller bearing with 240 mm bore, 440 mm OD and 120 mm width per ISO 15. SKF lists C 1450 kN, C0 2360 kN, Pu 224 kN, reference speed 1,500 r/min and limiting speed 2,200 r/min, mass about 86000 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2248-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2248-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2248",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU2248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 240×440×120 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2248-MA",
      "SKF NJ 2248 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2252-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2252 MA",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1790,
    "static_load_kN": 3000,
    "fatigue_load_limit_kN": 265,
    "max_rpm": 2000,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2000,
    "weight_g": 112000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2252 MA denotes a single-row caged cylindrical roller bearing on the ISO 15 260×480×130 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 112000 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NJ2252-MA: the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The mass entry 112000 g covers the complete catalogue execution. Fit practice for NJ2252-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2252, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2252 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 130 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1790/3000 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2252-MA?",
        "a": "SKF NJ 2252 MA is a single-row caged cylindrical roller bearing with 260 mm bore, 480 mm OD and 130 mm width per ISO 15. SKF lists C 1790 kN, C0 3000 kN, Pu 265 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 112000 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2252-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2252-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2252",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU2252-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 260×480×130 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2252-MA",
      "SKF NJ 2252 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ226-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 226 ECP",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 415,
    "static_load_kN": 455,
    "fatigue_load_limit_kN": 51,
    "max_rpm": 3400,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 3400,
    "weight_g": 6600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 226 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 130×230×40 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 6600 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.10 (455 against 415 kN), and the Pu figure 51 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,200 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Fit practice for NJ226-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 226, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 226 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.",
      "The 415/455 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ226-ECP?",
        "a": "SKF NJ 226 ECP is a single-row caged cylindrical roller bearing with 130 mm bore, 230 mm OD and 40 mm width per ISO 15. SKF lists C 415 kN, C0 455 kN, Pu 51 kN, reference speed 3,200 r/min and limiting speed 3,400 r/min, mass about 6600 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ226-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ226-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ226",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N226-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU226-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP226-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ226-ECP",
      "SKF NJ 226 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ228-ECJ",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 228 ECJ",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 450,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 57,
    "max_rpm": 3200,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3200,
    "weight_g": 8600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 140 mm shaft, SKF lists NJ228-ECJ as single-row caged cylindrical roller: 250 mm OD, 42 mm wide, Pu 57 kN, the catalogue lists 2,800 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECJ: the E-design execution with a pressed sheet-steel window cage, for positions where polymer cages are temperature- or lubricant-limited. Speed planning for NJ228-ECJ: the catalogue lists 2,800 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. The mass entry 8600 g covers the complete catalogue execution. Fit practice for NJ228-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 228, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 228 ECJ and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 42 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.",
      "The 450/510 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ228-ECJ?",
        "a": "SKF NJ 228 ECJ is a single-row caged cylindrical roller bearing with 140 mm bore, 250 mm OD and 42 mm width per ISO 15. SKF lists C 450 kN, C0 510 kN, Pu 57 kN, reference speed 2,800 r/min and limiting speed 3,200 r/min, mass about 8600 g."
      },
      {
        "q": "What does the NJ designation and ECJ suffix mean?",
        "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ228-ECJ take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ228-ECJ compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ228",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU228-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×250×42 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP228-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×250×42 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ228-ECJ",
      "SKF NJ 228 ECJ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ230-ECM",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 230 ECM",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 510,
    "static_load_kN": 600,
    "fatigue_load_limit_kN": 64,
    "max_rpm": 2800,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 2800,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 230 ECM resolves to a 150×270×45 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECM: the E-design ECM execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Load-per-bore for the 150 mm seat is about 3.40 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 600 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 150 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 230, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 230 ECM and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 510/600 kN ratings are SKF catalogue 17000 (2018) values for the ECM execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ230-ECM?",
        "a": "SKF NJ 230 ECM is a single-row caged cylindrical roller bearing with 150 mm bore, 270 mm OD and 45 mm width per ISO 15. SKF lists C 510 kN, C0 600 kN, Pu 64 kN, reference speed 2,600 r/min and limiting speed 2,800 r/min, mass about 12000 g."
      },
      {
        "q": "What does the NJ designation and ECM suffix mean?",
        "a": "The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ230-ECM take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ230-ECM compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ230",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU230-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×270×45 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP230-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×270×45 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ230-ECM",
      "SKF NJ 230 ECM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2304-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2304 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 47.5,
    "static_load_kN": 38,
    "fatigue_load_limit_kN": 4.8,
    "max_rpm": 18000,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 18000,
    "weight_g": 220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 20 mm shaft, SKF lists NJ2304-ECP as single-row caged cylindrical roller: 52 mm OD, 21 mm wide, Pu 4.8 kN, the catalogue lists 15,000 r/min thermal reference speed and 18,000 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 20 mm seat is about 2.38 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 38 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2304-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "small pump rotor shafts",
      "small industrial electric-motor shafts",
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2304, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2304 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 47.5/38 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2304-ECP?",
        "a": "SKF NJ 2304 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 52 mm OD and 21 mm width per ISO 15. SKF lists C 47.5 kN, C0 38 kN, Pu 4.8 kN, reference speed 15,000 r/min and limiting speed 18,000 r/min, mass about 220 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2304-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2304-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2304-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×52×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2304-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×52×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2304-ECP",
      "SKF NJ 2304 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2305-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2305 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 64,
    "static_load_kN": 55,
    "fatigue_load_limit_kN": 6.95,
    "max_rpm": 15000,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 15000,
    "weight_g": 350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 25 mm shaft, SKF lists NJ2305-ECP as single-row caged cylindrical roller: 62 mm OD, 24 mm wide, Pu 6.95 kN, the catalogue lists 12,000 r/min thermal reference speed and 15,000 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.86 (55 against 64 kN), and the Pu figure 6.95 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 12,000 r/min thermal reference speed and 15,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "small industrial electric-motor shafts",
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2305, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2305 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 64/55 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2305-ECP?",
        "a": "SKF NJ 2305 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 62 mm OD and 24 mm width per ISO 15. SKF lists C 64 kN, C0 55 kN, Pu 6.95 kN, reference speed 12,000 r/min and limiting speed 15,000 r/min, mass about 350 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2305-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2305-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×62×24 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×62×24 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2305-ECP",
      "SKF NJ 2305 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2306-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2306 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 83,
    "static_load_kN": 75,
    "fatigue_load_limit_kN": 9.65,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 540,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2306 ECP is a single-row caged cylindrical roller bearing sized 30×72×27 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 21.0 mm and the catalogue mass 540 g; at 83 kN dynamic rating this is roughly 2.77 kN of C per millimetre of bore before application factors. Fit practice for NJ2306-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2306, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2306 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 83/75 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2306-ECP?",
        "a": "SKF NJ 2306 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 72 mm OD and 27 mm width per ISO 15. SKF lists C 83 kN, C0 75 kN, Pu 9.65 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 540 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2306-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2306-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×72×27 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×72×27 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2306-ECP",
      "SKF NJ 2306 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2307-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2307 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 106,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 12.7,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 730,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2307 ECP is a single-row caged cylindrical roller bearing sized 35×80×31 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2307-ECP: the catalogue lists 9,500 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. The mass entry 730 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2307, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2307 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 106/98 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2307-ECP?",
        "a": "SKF NJ 2307 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 80 mm OD and 31 mm width per ISO 15. SKF lists C 106 kN, C0 98 kN, Pu 12.7 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 730 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2307-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2307-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×80×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×80×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2307-ECP",
      "SKF NJ 2307 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2308-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2308 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 129,
    "static_load_kN": 120,
    "fatigue_load_limit_kN": 15.3,
    "max_rpm": 9500,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 9500,
    "weight_g": 950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2308 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 40×90×33 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 950 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2308-ECP: the catalogue lists 8,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The mass entry 950 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2308, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2308 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "The 129/120 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2308-ECP?",
        "a": "SKF NJ 2308 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 90 mm OD and 33 mm width per ISO 15. SKF lists C 129 kN, C0 120 kN, Pu 15.3 kN, reference speed 8,000 r/min and limiting speed 9,500 r/min, mass about 950 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2308-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2308-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2308",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×90×33 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×90×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2308-ECP",
      "SKF NJ 2308 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2309-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2309 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 160,
    "static_load_kN": 153,
    "fatigue_load_limit_kN": 20,
    "max_rpm": 8500,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8500,
    "weight_g": 1350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2309 ECP resolves to a 45×100×36 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 45 mm seat is about 3.56 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 153 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2309, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2309 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 36 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "The 160/153 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2309-ECP?",
        "a": "SKF NJ 2309 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 100 mm OD and 36 mm width per ISO 15. SKF lists C 160 kN, C0 153 kN, Pu 20 kN, reference speed 7,500 r/min and limiting speed 8,500 r/min, mass about 1350 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2309-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2309-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2309",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×100×36 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×100×36 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2309-ECP",
      "SKF NJ 2309 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2310-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2310 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 186,
    "static_load_kN": 186,
    "fatigue_load_limit_kN": 24.5,
    "max_rpm": 8000,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 8000,
    "weight_g": 1750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2310 ECP is a single-row caged cylindrical roller bearing sized 50×110×40 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.00 (186 against 186 kN), and the Pu figure 24.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,700 r/min thermal reference speed and 8,000 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 50 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2310, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2310 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.",
      "The 186/186 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2310-ECP?",
        "a": "SKF NJ 2310 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 110 mm OD and 40 mm width per ISO 15. SKF lists C 186 kN, C0 186 kN, Pu 24.5 kN, reference speed 6,700 r/min and limiting speed 8,000 r/min, mass about 1750 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2310-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2310-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2310",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×110×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×110×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2310-ECP",
      "SKF NJ 2310 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2311-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2311 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 232,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 30.5,
    "max_rpm": 7000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 7000,
    "weight_g": 2250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2311 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 55×120×43 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 2250 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 32.5 mm and the catalogue mass 2250 g; at 232 kN dynamic rating this is roughly 4.22 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2311, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2311 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.",
      "The 232/232 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2311-ECP?",
        "a": "SKF NJ 2311 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 120 mm OD and 43 mm width per ISO 15. SKF lists C 232 kN, C0 232 kN, Pu 30.5 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 2250 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2311-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2311-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2311",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×120×43 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×120×43 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2311-ECP",
      "SKF NJ 2311 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2312-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2312 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 260,
    "static_load_kN": 265,
    "fatigue_load_limit_kN": 34.5,
    "max_rpm": 6700,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6700,
    "weight_g": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2312 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 60×130×46 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 2800 g. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. With C 260 kN and C0 265 kN, size the bearing on the 60×130 mm ISO 15 envelope and check the 34.5 kN Pu against the equivalent-load floor; the catalogue lists 5,600 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2312, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2312 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.",
      "The 260/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2312-ECP?",
        "a": "SKF NJ 2312 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 130 mm OD and 46 mm width per ISO 15. SKF lists C 260 kN, C0 265 kN, Pu 34.5 kN, reference speed 5,600 r/min and limiting speed 6,700 r/min, mass about 2800 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2312-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2312-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2312",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NUP2312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×130×46 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU2312",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×130×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2312-ECP",
      "SKF NJ 2312 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2313-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2313 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 285,
    "static_load_kN": 290,
    "fatigue_load_limit_kN": 38,
    "max_rpm": 6000,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 6000,
    "weight_g": 3350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2313 ECP resolves to a 65×140×48 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2313-ECP: the catalogue lists 5,300 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The mass entry 3350 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2313, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2313 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.",
      "The 285/290 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2313-ECP?",
        "a": "SKF NJ 2313 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 140 mm OD and 48 mm width per ISO 15. SKF lists C 285 kN, C0 290 kN, Pu 38 kN, reference speed 5,300 r/min and limiting speed 6,000 r/min, mass about 3350 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2313-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2313-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2313",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2313-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×140×48 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2313-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×140×48 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2313-ECP",
      "SKF NJ 2313 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2314-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2314 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 315,
    "static_load_kN": 325,
    "fatigue_load_limit_kN": 41.5,
    "max_rpm": 5600,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5600,
    "weight_g": 4000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2314 ECP resolves to a 70×150×51 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.03 (325 against 315 kN), and the Pu figure 41.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,800 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2314, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2314 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 51 mm-wide ring and concentrates load.",
      "The 315/325 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2314-ECP?",
        "a": "SKF NJ 2314 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 150 mm OD and 51 mm width per ISO 15. SKF lists C 315 kN, C0 325 kN, Pu 41.5 kN, reference speed 4,800 r/min and limiting speed 5,600 r/min, mass about 4000 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2314-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2314-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2314",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2314-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×150×51 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2314-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×150×51 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2314-ECP",
      "SKF NJ 2314 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2315-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2315 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 380,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 50,
    "max_rpm": 5300,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 5300,
    "weight_g": 5000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2315-ECP is the 75 mm bore entry in the NJ2300 range: a 75×160×55 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 380 kN / C0 400 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 42.5 mm and the catalogue mass 5000 g; at 380 kN dynamic rating this is roughly 5.07 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2315, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2315 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 55 mm-wide ring and concentrates load.",
      "The 380/400 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2315-ECP?",
        "a": "SKF NJ 2315 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 160 mm OD and 55 mm width per ISO 15. SKF lists C 380 kN, C0 400 kN, Pu 50 kN, reference speed 4,500 r/min and limiting speed 5,300 r/min, mass about 5000 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2315-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2315-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2315",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2315-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×160×55 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2315-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×160×55 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2315-ECP",
      "SKF NJ 2315 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2316-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2316 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 415,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 55,
    "max_rpm": 5000,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5000,
    "weight_g": 5950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 80 mm shaft, SKF lists NJ2316-ECP as single-row caged cylindrical roller: 170 mm OD, 58 mm wide, Pu 55 kN, the catalogue lists 4,300 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 415 kN and C0 440 kN, size the bearing on the 80×170 mm ISO 15 envelope and check the 55 kN Pu against the equivalent-load floor; the catalogue lists 4,300 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Fit practice for NJ2316-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2316, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2316 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.",
      "The 415/440 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2316-ECP?",
        "a": "SKF NJ 2316 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 170 mm OD and 58 mm width per ISO 15. SKF lists C 415 kN, C0 440 kN, Pu 55 kN, reference speed 4,300 r/min and limiting speed 5,000 r/min, mass about 5950 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2316-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2316-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2316",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2316-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×170×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2316-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×170×58 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2316-ECP",
      "SKF NJ 2316 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2317-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2317 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 455,
    "static_load_kN": 490,
    "fatigue_load_limit_kN": 60,
    "max_rpm": 4800,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4800,
    "weight_g": 7000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 85 mm shaft, SKF lists NJ2317-ECP as single-row caged cylindrical roller: 180 mm OD, 60 mm wide, Pu 60 kN, the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2317-ECP: the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 7000 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2317, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2317 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.",
      "The 455/490 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2317-ECP?",
        "a": "SKF NJ 2317 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 180 mm OD and 60 mm width per ISO 15. SKF lists C 455 kN, C0 490 kN, Pu 60 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 7000 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2317-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2317-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2317",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2317-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×180×60 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2317-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×180×60 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2317-ECP",
      "SKF NJ 2317 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2318-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2318 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 500,
    "static_load_kN": 540,
    "fatigue_load_limit_kN": 65.5,
    "max_rpm": 4500,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4500,
    "weight_g": 8150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2318 ECP is a single-row caged cylindrical roller bearing sized 90×190×64 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 90 mm seat is about 5.56 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 540 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2318-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2318, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2318 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 64 mm-wide ring and concentrates load.",
      "The 500/540 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2318-ECP?",
        "a": "SKF NJ 2318 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 190 mm OD and 64 mm width per ISO 15. SKF lists C 500 kN, C0 540 kN, Pu 65.5 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 8150 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2318-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2318-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2318",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2318-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×190×64 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2318-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×190×64 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2318-ECP",
      "SKF NJ 2318 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2319-ECJ",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2319 ECJ",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 530,
    "static_load_kN": 585,
    "fatigue_load_limit_kN": 69.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4300,
    "weight_g": 9550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2319 ECJ resolves to a 95×200×67 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECJ: the E-design execution with a pressed sheet-steel window cage, for positions where polymer cages are temperature- or lubricant-limited. Selection arithmetic: C0/C ≈ 1.10 (585 against 530 kN), and the Pu figure 69.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,600 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2319, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2319 ECJ and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 67 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 67 mm-wide ring and concentrates load.",
      "The 530/585 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2319-ECJ?",
        "a": "SKF NJ 2319 ECJ is a single-row caged cylindrical roller bearing with 95 mm bore, 200 mm OD and 67 mm width per ISO 15. SKF lists C 530 kN, C0 585 kN, Pu 69.5 kN, reference speed 3,600 r/min and limiting speed 4,300 r/min, mass about 9550 g."
      },
      {
        "q": "What does the NJ designation and ECJ suffix mean?",
        "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2319-ECJ take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2319-ECJ compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2319",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2319-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×200×67 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2319-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×200×67 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2319-ECJ",
      "SKF NJ 2319 ECJ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ232-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 232 ECML",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 585,
    "static_load_kN": 680,
    "fatigue_load_limit_kN": 72,
    "max_rpm": 4000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4000,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 232 ECML resolves to a 160×290×48 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 160 mm seat is about 3.66 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 680 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 232, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 232 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.",
      "The 585/680 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ232-ECML?",
        "a": "SKF NJ 232 ECML is a single-row caged cylindrical roller bearing with 160 mm bore, 290 mm OD and 48 mm width per ISO 15. SKF lists C 585 kN, C0 680 kN, Pu 72 kN, reference speed 2,400 r/min and limiting speed 4,000 r/min, mass about 14500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ232-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ232-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ232",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU232-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×290×48 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP232-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×290×48 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ232-ECML",
      "SKF NJ 232 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2320-ECJ",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2320 ECJ",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 670,
    "static_load_kN": 735,
    "fatigue_load_limit_kN": 85,
    "max_rpm": 3800,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 3800,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2320 ECJ denotes a single-row caged cylindrical roller bearing on the ISO 15 100×215×73 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 12000 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. The radial section height is 57.5 mm and the catalogue mass 12000 g; at 670 kN dynamic rating this is roughly 6.70 kN of C per millimetre of bore before application factors. Fit practice for NJ2320-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2320, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2320 ECJ and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 670/735 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2320-ECJ?",
        "a": "SKF NJ 2320 ECJ is a single-row caged cylindrical roller bearing with 100 mm bore, 215 mm OD and 73 mm width per ISO 15. SKF lists C 670 kN, C0 735 kN, Pu 85 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 12000 g."
      },
      {
        "q": "What does the NJ designation and ECJ suffix mean?",
        "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2320-ECJ take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2320-ECJ compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2320",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2320-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×215×73 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2320-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×215×73 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2320-ECJ",
      "SKF NJ 2320 ECJ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2322-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2322 ECP",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 780,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 102,
    "max_rpm": 3400,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3400,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2322 ECP is a single-row caged cylindrical roller bearing sized 110×240×80 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2322-ECP: the catalogue lists 3,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The mass entry 17000 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2322, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2322 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 240 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 240 mm raceway.",
      "The 780/900 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2322-ECP?",
        "a": "SKF NJ 2322 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 240 mm OD and 80 mm width per ISO 15. SKF lists C 780 kN, C0 900 kN, Pu 102 kN, reference speed 3,000 r/min and limiting speed 3,400 r/min, mass about 17000 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2322-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2322-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2322",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2322-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×240×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2322-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×240×80 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2322-ECP",
      "SKF NJ 2322 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2324-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2324 ECML",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 915,
    "static_load_kN": 1040,
    "fatigue_load_limit_kN": 116,
    "max_rpm": 5000,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 5000,
    "weight_g": 23000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2324 ECML is a single-row caged cylindrical roller bearing sized 120×260×86 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 70.0 mm and the catalogue mass 23000 g; at 915 kN dynamic rating this is roughly 7.63 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2324, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2324 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.",
      "The 915/1040 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2324-ECML?",
        "a": "SKF NJ 2324 ECML is a single-row caged cylindrical roller bearing with 120 mm bore, 260 mm OD and 86 mm width per ISO 15. SKF lists C 915 kN, C0 1040 kN, Pu 116 kN, reference speed 2,800 r/min and limiting speed 5,000 r/min, mass about 23000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2324-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2324-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2324",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2324-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×260×86 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2324-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×260×86 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2324-ECML",
      "SKF NJ 2324 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2326-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2326 ECML",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 137,
    "max_rpm": 4500,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4500,
    "weight_g": 29500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2326 ECML resolves to a 130×280×93 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. With C 1060 kN and C0 1250 kN, size the bearing on the 130×280 mm ISO 15 envelope and check the 137 kN Pu against the equivalent-load floor; the catalogue lists 2,400 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. Fit practice for NJ2326-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2326, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2326 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 93 mm-wide ring and concentrates load.",
      "The 1060/1250 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2326-ECML?",
        "a": "SKF NJ 2326 ECML is a single-row caged cylindrical roller bearing with 130 mm bore, 280 mm OD and 93 mm width per ISO 15. SKF lists C 1060 kN, C0 1250 kN, Pu 137 kN, reference speed 2,400 r/min and limiting speed 4,500 r/min, mass about 29500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2326-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2326-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2326",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×280×93 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2326-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×280×93 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2326-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×280×93 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2326-ECML",
      "SKF NJ 2326 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2328-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2328 ECML",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1200,
    "static_load_kN": 1430,
    "fatigue_load_limit_kN": 150,
    "max_rpm": 4300,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 4300,
    "weight_g": 36500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 140 mm shaft, SKF lists NJ2328-ECML as single-row caged cylindrical roller: 300 mm OD, 102 mm wide, Pu 150 kN, the catalogue lists 2,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Load-per-bore for the 140 mm seat is about 8.57 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 1430 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2328-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2328, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2328 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 102 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 102 mm-wide ring and concentrates load.",
      "The 1200/1430 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2328-ECML?",
        "a": "SKF NJ 2328 ECML is a single-row caged cylindrical roller bearing with 140 mm bore, 300 mm OD and 102 mm width per ISO 15. SKF lists C 1200 kN, C0 1430 kN, Pu 150 kN, reference speed 2,400 r/min and limiting speed 4,300 r/min, mass about 36500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2328-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2328-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2328",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×300×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2328-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×300×102 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP2328-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×300×102 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2328-ECML",
      "SKF NJ 2328 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2330-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2330 ECML",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1370,
    "static_load_kN": 1630,
    "fatigue_load_limit_kN": 170,
    "max_rpm": 4000,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 4000,
    "weight_g": 43000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 150 mm shaft, SKF lists NJ2330-ECML as single-row caged cylindrical roller: 320 mm OD, 108 mm wide, Pu 170 kN, the catalogue lists 2,200 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Load-per-bore for the 150 mm seat is about 9.13 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 1630 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2330-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2330, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2330 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 108 mm-wide ring and concentrates load.",
      "The 1370/1630 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2330-ECML?",
        "a": "SKF NJ 2330 ECML is a single-row caged cylindrical roller bearing with 150 mm bore, 320 mm OD and 108 mm width per ISO 15. SKF lists C 1370 kN, C0 1630 kN, Pu 170 kN, reference speed 2,200 r/min and limiting speed 4,000 r/min, mass about 43000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2330-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2330-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2330",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×320×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2330-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×320×108 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2330-ECML",
      "SKF NJ 2330 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2332-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2332 ECML",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1250,
    "static_load_kN": 1730,
    "fatigue_load_limit_kN": 173,
    "max_rpm": 3600,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 3600,
    "weight_g": 50500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2332 ECML denotes a single-row caged cylindrical roller bearing on the ISO 15 160×340×114 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 50500 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The radial section height is 90.0 mm and the catalogue mass 50500 g; at 1250 kN dynamic rating this is roughly 7.81 kN of C per millimetre of bore before application factors. Fit practice for NJ2332-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2332, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2332 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 114 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 114 mm-wide ring and concentrates load.",
      "The 1250/1730 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2332-ECML?",
        "a": "SKF NJ 2332 ECML is a single-row caged cylindrical roller bearing with 160 mm bore, 340 mm OD and 114 mm width per ISO 15. SKF lists C 1250 kN, C0 1730 kN, Pu 173 kN, reference speed 1,800 r/min and limiting speed 3,600 r/min, mass about 50500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2332-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2332-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2332",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×340×114 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2332-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×340×114 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2332-ECML",
      "SKF NJ 2332 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2334-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2334 ECML",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1450,
    "static_load_kN": 2040,
    "fatigue_load_limit_kN": 204,
    "max_rpm": 3400,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3400,
    "weight_g": 60500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2334-ECML is the 170 mm bore entry in the NJ2300 range: a 170×360×120 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1450 kN / C0 2040 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. With C 1450 kN and C0 2040 kN, size the bearing on the 170×360 mm ISO 15 envelope and check the 204 kN Pu against the equivalent-load floor; the catalogue lists 1,700 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2334, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2334 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1450/2040 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2334-ECML?",
        "a": "SKF NJ 2334 ECML is a single-row caged cylindrical roller bearing with 170 mm bore, 360 mm OD and 120 mm width per ISO 15. SKF lists C 1450 kN, C0 2040 kN, Pu 204 kN, reference speed 1,700 r/min and limiting speed 3,400 r/min, mass about 60500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2334-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2334-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2334",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×360×120 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2334-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×360×120 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2334-ECML",
      "SKF NJ 2334 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2336-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2336 ECML",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1610,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 216,
    "max_rpm": 3200,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 3200,
    "weight_g": 70500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2336 ECML denotes a single-row caged cylindrical roller bearing on the ISO 15 180×380×126 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 70500 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 180 mm seat is about 8.94 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 2240 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2336-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2336, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2336 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1610/2240 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2336-ECML?",
        "a": "SKF NJ 2336 ECML is a single-row caged cylindrical roller bearing with 180 mm bore, 380 mm OD and 126 mm width per ISO 15. SKF lists C 1610 kN, C0 2240 kN, Pu 216 kN, reference speed 1,600 r/min and limiting speed 3,200 r/min, mass about 70500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2336-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2336-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2336",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×380×126 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2336-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×380×126 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2336-ECML",
      "SKF NJ 2336 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2338-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2338 ECML",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1830,
    "static_load_kN": 2550,
    "fatigue_load_limit_kN": 236,
    "max_rpm": 3000,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 3000,
    "weight_g": 82000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2338-ECML is the 190 mm bore entry in the NJ2300 range: a 190×400×132 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1830 kN / C0 2550 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 105.0 mm and the catalogue mass 82000 g; at 1830 kN dynamic rating this is roughly 9.63 kN of C per millimetre of bore before application factors. Fit practice for NJ2338-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2338, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2338 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 132 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1830/2550 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2338-ECML?",
        "a": "SKF NJ 2338 ECML is a single-row caged cylindrical roller bearing with 190 mm bore, 400 mm OD and 132 mm width per ISO 15. SKF lists C 1830 kN, C0 2550 kN, Pu 236 kN, reference speed 1,500 r/min and limiting speed 3,000 r/min, mass about 82000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2338-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2338-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2338",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×400×132 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2338-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×400×132 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2338-ECML",
      "SKF NJ 2338 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ234-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 234 ECML",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 695,
    "static_load_kN": 815,
    "fatigue_load_limit_kN": 85,
    "max_rpm": 3800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3800,
    "weight_g": 17500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 234 ECML is a single-row caged cylindrical roller bearing sized 170×310×52 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The radial section height is 70.0 mm and the catalogue mass 17500 g; at 695 kN dynamic rating this is roughly 4.09 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 234, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 234 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 52 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 310 mm raceway.",
      "The 695/815 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ234-ECML?",
        "a": "SKF NJ 234 ECML is a single-row caged cylindrical roller bearing with 170 mm bore, 310 mm OD and 52 mm width per ISO 15. SKF lists C 695 kN, C0 815 kN, Pu 85 kN, reference speed 2,200 r/min and limiting speed 3,800 r/min, mass about 17500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ234-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ234-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ234",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU234-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×310×52 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ234-ECML",
      "SKF NJ 234 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2340-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2340 ECML",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1980,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 255,
    "max_rpm": 2800,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2800,
    "weight_g": 94000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2340 ECML resolves to a 200×420×138 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. The radial section height is 110.0 mm and the catalogue mass 94000 g; at 1980 kN dynamic rating this is roughly 9.90 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2340, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2340 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1980/2800 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2340-ECML?",
        "a": "SKF NJ 2340 ECML is a single-row caged cylindrical roller bearing with 200 mm bore, 420 mm OD and 138 mm width per ISO 15. SKF lists C 1980 kN, C0 2800 kN, Pu 255 kN, reference speed 1,400 r/min and limiting speed 2,800 r/min, mass about 94000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2340-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2340-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2340",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×420×138 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2340-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×420×138 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2340-ECML",
      "SKF NJ 2340 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2352-ECMA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2352 ECMA",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3140,
    "static_load_kN": 4550,
    "fatigue_load_limit_kN": 400,
    "max_rpm": 1900,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1900,
    "weight_g": 196000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2352 ECMA is a single-row caged cylindrical roller bearing sized 260×540×165 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Load-per-bore for the 260 mm seat is about 12.08 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 4550 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 260 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2352, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2352 ECMA and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 3140/4550 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2352-ECMA?",
        "a": "SKF NJ 2352 ECMA is a single-row caged cylindrical roller bearing with 260 mm bore, 540 mm OD and 165 mm width per ISO 15. SKF lists C 3140 kN, C0 4550 kN, Pu 400 kN, reference speed 1,100 r/min and limiting speed 1,900 r/min, mass about 196000 g."
      },
      {
        "q": "What does the NJ designation and ECMA suffix mean?",
        "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2352-ECMA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2352-ECMA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2352",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 260×540×165 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU2352-ECMA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 260×540×165 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2352-ECMA",
      "SKF NJ 2352 ECMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ236-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 236 ECML",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 720,
    "static_load_kN": 850,
    "fatigue_load_limit_kN": 88,
    "max_rpm": 3600,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 3600,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 236 ECML resolves to a 180×320×52 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Speed planning for NJ236-ECML: the catalogue lists 2,200 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 18500 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 236, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 236 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "The 720/850 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ236-ECML?",
        "a": "SKF NJ 236 ECML is a single-row caged cylindrical roller bearing with 180 mm bore, 320 mm OD and 52 mm width per ISO 15. SKF lists C 720 kN, C0 850 kN, Pu 88 kN, reference speed 2,200 r/min and limiting speed 3,600 r/min, mass about 18500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ236-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ236-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ236",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×320×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU236-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×320×52 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ236-ECML",
      "SKF NJ 236 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ238-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 238 ECML",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 800,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 98,
    "max_rpm": 3400,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 3400,
    "weight_g": 22000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 190 mm shaft, SKF lists NJ238-ECML as single-row caged cylindrical roller: 340 mm OD, 55 mm wide, Pu 98 kN, the catalogue lists 2,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.21 (965 against 800 kN), and the Pu figure 98 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 238, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 238 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.",
      "The 800/965 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ238-ECML?",
        "a": "SKF NJ 238 ECML is a single-row caged cylindrical roller bearing with 190 mm bore, 340 mm OD and 55 mm width per ISO 15. SKF lists C 800 kN, C0 965 kN, Pu 98 kN, reference speed 2,000 r/min and limiting speed 3,400 r/min, mass about 22000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ238-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ238-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ238",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU238-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×340×55 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP238-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×340×55 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ238-ECML",
      "SKF NJ 238 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ240-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 240 ECML",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 880,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 106,
    "max_rpm": 3200,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 3200,
    "weight_g": 27000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 200 mm shaft, SKF lists NJ240-ECML as single-row caged cylindrical roller: 360 mm OD, 58 mm wide, Pu 106 kN, the catalogue lists 1,900 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Load-per-bore for the 200 mm seat is about 4.40 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 1060 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 240, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 240 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.",
      "The 880/1060 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ240-ECML?",
        "a": "SKF NJ 240 ECML is a single-row caged cylindrical roller bearing with 200 mm bore, 360 mm OD and 58 mm width per ISO 15. SKF lists C 880 kN, C0 1060 kN, Pu 106 kN, reference speed 1,900 r/min and limiting speed 3,200 r/min, mass about 27000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ240-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ240-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ240",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×360×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU240-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×360×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ240-ECML",
      "SKF NJ 240 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ244-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 244 ECML",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 125,
    "max_rpm": 3000,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 3000,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ244-ECML is the 220 mm bore entry in the NJ200 range: a 220×400×65 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1060 kN / C0 1290 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Speed planning for NJ244-ECML: the catalogue lists 1,700 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The mass entry 37000 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 244, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 244 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 65 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 65 mm-wide ring and concentrates load.",
      "The 1060/1290 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ244-ECML?",
        "a": "SKF NJ 244 ECML is a single-row caged cylindrical roller bearing with 220 mm bore, 400 mm OD and 65 mm width per ISO 15. SKF lists C 1060 kN, C0 1290 kN, Pu 125 kN, reference speed 1,700 r/min and limiting speed 3,000 r/min, mass about 37000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ244-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ244-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ244",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU244-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×400×65 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP244-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×400×65 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ244-ECML",
      "SKF NJ 244 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ248-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 248 MA",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 952,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 129,
    "max_rpm": 2200,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2200,
    "weight_g": 53000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 248 MA denotes a single-row caged cylindrical roller bearing on the ISO 15 240×440×72 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 53000 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 1.44 (1370 against 952 kN), and the Pu figure 129 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,600 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Fit practice for NJ248-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 248, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 248 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.",
      "The 952/1370 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ248-MA?",
        "a": "SKF NJ 248 MA is a single-row caged cylindrical roller bearing with 240 mm bore, 440 mm OD and 72 mm width per ISO 15. SKF lists C 952 kN, C0 1370 kN, Pu 129 kN, reference speed 1,600 r/min and limiting speed 2,200 r/min, mass about 53000 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ248-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ248-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ248",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 240×440×72 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 240×440×72 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ248-MA",
      "SKF NJ 248 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ252-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 252 MA",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1170,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 150,
    "max_rpm": 2000,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2000,
    "weight_g": 69000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 252 MA denotes a single-row caged cylindrical roller bearing on the ISO 15 260×480×80 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 69000 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 1170 kN and C0 1700 kN, size the bearing on the 260×480 mm ISO 15 envelope and check the 150 kN Pu against the equivalent-load floor; the catalogue lists 1,400 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Fit practice for NJ252-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 252, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 252 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1170/1700 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ252-MA?",
        "a": "SKF NJ 252 MA is a single-row caged cylindrical roller bearing with 260 mm bore, 480 mm OD and 80 mm width per ISO 15. SKF lists C 1170 kN, C0 1700 kN, Pu 150 kN, reference speed 1,400 r/min and limiting speed 2,000 r/min, mass about 69000 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ252-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ252-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ252",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU252-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 260×480×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP252-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 260×480×80 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ252-MA",
      "SKF NJ 252 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ256-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 256 MA",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1800,
    "fatigue_load_limit_kN": 156,
    "max_rpm": 1900,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1900,
    "weight_g": 73000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 256 MA is a single-row caged cylindrical roller bearing sized 280×500×80 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. The radial section height is 110.0 mm and the catalogue mass 73000 g; at 1140 kN dynamic rating this is roughly 4.07 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 280 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 256, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 256 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1140/1800 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ256-MA?",
        "a": "SKF NJ 256 MA is a single-row caged cylindrical roller bearing with 280 mm bore, 500 mm OD and 80 mm width per ISO 15. SKF lists C 1140 kN, C0 1800 kN, Pu 156 kN, reference speed 1,400 r/min and limiting speed 1,900 r/min, mass about 73000 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ256-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ256-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ256",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 280×500×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU256-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 280×500×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ256-MA",
      "SKF NJ 256 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ28-710-ECMA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 28/710 ECMA",
    "series": "NJ2800-series",
    "type": "cylindrical_roller",
    "d_mm": 710,
    "D_mm": 870,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1940,
    "static_load_kN": 5000,
    "fatigue_load_limit_kN": 375,
    "max_rpm": 850,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 850,
    "weight_g": 130000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 710 mm shaft, SKF lists NJ28-710-ECMA as single-row caged cylindrical roller: 870 mm OD, 95 mm wide, Pu 375 kN, the catalogue lists 630 r/min thermal reference speed and 850 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. The radial section height is 80.0 mm and the catalogue mass 130000 g; at 1940 kN dynamic rating this is roughly 2.73 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 710 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 28 (slim section, wide) envelope is shared with the N/NU/NJ/NUP executions of 28/710, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 28/710 ECMA and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1940/5000 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ28-710-ECMA?",
        "a": "SKF NJ 28/710 ECMA is a single-row caged cylindrical roller bearing with 710 mm bore, 870 mm OD and 95 mm width per ISO 15. SKF lists C 1940 kN, C0 5000 kN, Pu 375 kN, reference speed 630 r/min and limiting speed 850 r/min, mass about 130000 g."
      },
      {
        "q": "What does the NJ designation and ECMA suffix mean?",
        "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ28-710-ECMA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ28-710-ECMA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ28",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ28-710-ECMA",
      "SKF NJ 28/710 ECMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2892-ECMA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2892 ECMA",
    "series": "NJ2800-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 580,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1080,
    "static_load_kN": 2400,
    "fatigue_load_limit_kN": 193,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 48000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 2892 ECMA is a single-row caged cylindrical roller bearing sized 460×580×72 mm — a dimension series 28 (slim section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. The radial section height is 60.0 mm and the catalogue mass 48000 g; at 1080 kN dynamic rating this is roughly 2.35 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 28 (slim section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2892, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2892 ECMA and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 580 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "The 1080/2400 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2892-ECMA?",
        "a": "SKF NJ 2892 ECMA is a single-row caged cylindrical roller bearing with 460 mm bore, 580 mm OD and 72 mm width per ISO 15. SKF lists C 1080 kN, C0 2400 kN, Pu 193 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 48000 g."
      },
      {
        "q": "What does the NJ designation and ECMA suffix mean?",
        "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2892-ECMA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2892-ECMA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2892",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2892-ECMA",
      "SKF NJ 2892 ECMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ29-630-ECMA-HB1",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 29/630 ECMA/HB1",
    "series": "NJ2900-series",
    "type": "cylindrical_roller",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 3300,
    "static_load_kN": 7200,
    "fatigue_load_limit_kN": 510,
    "max_rpm": 900,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 900,
    "weight_g": 230000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 29/630 ECMA/HB1 is a single-row caged cylindrical roller bearing sized 630×850×128 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NJ29-630-ECMA-HB1: the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. The mass entry 230000 g covers the complete catalogue execution. Fit practice for NJ29-630-ECMA-HB1: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 29/630, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 29/630 ECMA/HB1 and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 3300/7200 kN ratings are SKF catalogue 17000 (2018) values for the ECMA/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ29-630-ECMA-HB1?",
        "a": "SKF NJ 29/630 ECMA/HB1 is a single-row caged cylindrical roller bearing with 630 mm bore, 850 mm OD and 128 mm width per ISO 15. SKF lists C 3300 kN, C0 7200 kN, Pu 510 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 230000 g."
      },
      {
        "q": "What does the NJ designation and ECMA/HB1 suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ29-630-ECMA-HB1 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ29-630-ECMA-HB1 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU29-630-ECMA-HB1",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 630×850×128 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ29-630-ECMA-HB1",
      "SKF NJ 29/630 ECMA/HB1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2968-ECMA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2968 ECMA",
    "series": "NJ2900-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1020,
    "static_load_kN": 2040,
    "fatigue_load_limit_kN": 186,
    "max_rpm": 1900,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 340 mm shaft, SKF lists NJ2968-ECMA as single-row caged cylindrical roller: 460 mm OD, 72 mm wide, Pu 186 kN, the catalogue lists 1,400 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 60.0 mm and the catalogue mass 37000 g; at 1020 kN dynamic rating this is roughly 3.00 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 340 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 2968, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2968 ECMA and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.",
      "The 1020/2040 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2968-ECMA?",
        "a": "SKF NJ 2968 ECMA is a single-row caged cylindrical roller bearing with 340 mm bore, 460 mm OD and 72 mm width per ISO 15. SKF lists C 1020 kN, C0 2040 kN, Pu 186 kN, reference speed 1,400 r/min and limiting speed 1,900 r/min, mass about 37000 g."
      },
      {
        "q": "What does the NJ designation and ECMA suffix mean?",
        "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2968-ECMA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2968-ECMA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2968",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2968-ECMA",
      "SKF NJ 2968 ECMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2980-ECMA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2980 ECMA",
    "series": "NJ2900-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1380,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 245,
    "max_rpm": 1600,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1600,
    "weight_g": 57000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 2980 ECMA resolves to a 400×540×82 mm single-row caged cylindrical roller bearing (dimension series 29 (compact OD, normal width)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Speed planning for NJ2980-ECMA: the catalogue lists 1,200 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. The mass entry 57000 g covers the complete catalogue execution. Fit practice for NJ2980-ECMA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 2980, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2980 ECMA and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.",
      "The 1380/2800 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2980-ECMA?",
        "a": "SKF NJ 2980 ECMA is a single-row caged cylindrical roller bearing with 400 mm bore, 540 mm OD and 82 mm width per ISO 15. SKF lists C 1380 kN, C0 2800 kN, Pu 245 kN, reference speed 1,200 r/min and limiting speed 1,600 r/min, mass about 57000 g."
      },
      {
        "q": "What does the NJ designation and ECMA suffix mean?",
        "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2980-ECMA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2980-ECMA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2980",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2980-ECMA",
      "SKF NJ 2980 ECMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2988-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2988 ECML",
    "series": "NJ2900-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1870,
    "static_load_kN": 3900,
    "fatigue_load_limit_kN": 340,
    "max_rpm": 1600,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1600,
    "weight_g": 83000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 440 mm shaft, SKF lists NJ2988-ECML as single-row caged cylindrical roller: 600 mm OD, 95 mm wide, Pu 340 kN, the catalogue lists 1,100 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Load-per-bore for the 440 mm seat is about 4.25 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 3900 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 440 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 2988, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2988 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 600 mm raceway.",
      "The 1870/3900 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2988-ECML?",
        "a": "SKF NJ 2988 ECML is a single-row caged cylindrical roller bearing with 440 mm bore, 600 mm OD and 95 mm width per ISO 15. SKF lists C 1870 kN, C0 3900 kN, Pu 340 kN, reference speed 1,100 r/min and limiting speed 1,600 r/min, mass about 83000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2988-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2988-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2988-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 440×600×95 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2988-ECML",
      "SKF NJ 2988 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2992-ECMA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 2992 ECMA",
    "series": "NJ2900-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1720,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 310,
    "max_rpm": 1300,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1300,
    "weight_g": 89000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2992-ECMA is the 460 mm bore entry in the NJ2900 range: a 460×620×95 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1720 kN / C0 3600 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. With C 1720 kN and C0 3600 kN, size the bearing on the 460×620 mm ISO 15 envelope and check the 310 kN Pu against the equivalent-load floor; the catalogue lists 1,000 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Fit practice for NJ2992-ECMA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 2992, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2992 ECMA and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.",
      "The 1720/3600 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2992-ECMA?",
        "a": "SKF NJ 2992 ECMA is a single-row caged cylindrical roller bearing with 460 mm bore, 620 mm OD and 95 mm width per ISO 15. SKF lists C 1720 kN, C0 3600 kN, Pu 310 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 89000 g."
      },
      {
        "q": "What does the NJ designation and ECMA suffix mean?",
        "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ2992-ECMA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ2992-ECMA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2992",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ2992-ECMA",
      "SKF NJ 2992 ECMA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ303-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 303 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 17,
    "D_mm": 47,
    "B_mm": 14,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 28.5,
    "static_load_kN": 20.4,
    "fatigue_load_limit_kN": 2.55,
    "max_rpm": 20000,
    "reference_speed_rpm": 17000,
    "limiting_speed_rpm": 20000,
    "weight_g": 120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 303 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 17×47×14 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 120 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 28.5 kN and C0 20.4 kN, size the bearing on the 17×47 mm ISO 15 envelope and check the 2.55 kN Pu against the equivalent-load floor; the catalogue lists 17,000 r/min thermal reference speed and 20,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "motor-cycle and small-engine transmissions",
      "appliance and fan armature shafts",
      "small pump rotor shafts",
      "small industrial electric-motor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 303, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 303 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 47 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 14 mm-wide ring and concentrates load.",
      "The 28.5/20.4 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ303-ECP?",
        "a": "SKF NJ 303 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 47 mm OD and 14 mm width per ISO 15. SKF lists C 28.5 kN, C0 20.4 kN, Pu 2.55 kN, reference speed 17,000 r/min and limiting speed 20,000 r/min, mass about 120 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ303-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ303-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N303-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×47×14 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU303-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 17×47×14 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ303-ECP",
      "SKF NJ 303 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ304-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 304 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 20,
    "D_mm": 52,
    "B_mm": 15,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 35.5,
    "static_load_kN": 26,
    "fatigue_load_limit_kN": 3.25,
    "max_rpm": 18000,
    "reference_speed_rpm": 15000,
    "limiting_speed_rpm": 18000,
    "weight_g": 150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 304 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 20×52×15 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 150 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ304-ECP: the catalogue lists 15,000 r/min thermal reference speed and 18,000 r/min mechanical limiting speed. The mass entry 150 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 20 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "appliance and fan armature shafts",
      "small pump rotor shafts",
      "small industrial electric-motor shafts",
      "light gearbox layshafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 304, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 304 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 15 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 15 mm-wide ring and concentrates load.",
      "The 35.5/26 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ304-ECP?",
        "a": "SKF NJ 304 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 52 mm OD and 15 mm width per ISO 15. SKF lists C 35.5 kN, C0 26 kN, Pu 3.25 kN, reference speed 15,000 r/min and limiting speed 18,000 r/min, mass about 150 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ304-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ304-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N304-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP304-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU304",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ304-ECP",
      "SKF NJ 304 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ305-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 305 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 17,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 46.5,
    "static_load_kN": 36.5,
    "fatigue_load_limit_kN": 4.55,
    "max_rpm": 15000,
    "reference_speed_rpm": 12000,
    "limiting_speed_rpm": 15000,
    "weight_g": 240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 305 ECP resolves to a 25×62×17 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 25 mm seat is about 1.86 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 36.5 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "small pump rotor shafts",
      "small industrial electric-motor shafts",
      "light gearbox layshafts",
      "motor-cycle and small-engine transmissions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 305, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 305 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 17 mm-wide ring and concentrates load.",
      "The 46.5/36.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ305-ECP?",
        "a": "SKF NJ 305 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 62 mm OD and 17 mm width per ISO 15. SKF lists C 46.5 kN, C0 36.5 kN, Pu 4.55 kN, reference speed 12,000 r/min and limiting speed 15,000 r/min, mass about 240 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ305-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ305-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP305-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU305",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ305-ECP",
      "SKF NJ 305 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ306-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 306 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 19,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 58.5,
    "static_load_kN": 48,
    "fatigue_load_limit_kN": 6.2,
    "max_rpm": 12000,
    "reference_speed_rpm": 11000,
    "limiting_speed_rpm": 12000,
    "weight_g": 370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ306-ECP is the 30 mm bore entry in the NJ300 range: a 30×72×19 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 58.5 kN / C0 48 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.82 (48 against 58.5 kN), and the Pu figure 6.2 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 11,000 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. Fit practice for NJ306-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 306, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 306 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.",
      "The 58.5/48 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ306-ECP?",
        "a": "SKF NJ 306 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 72 mm OD and 19 mm width per ISO 15. SKF lists C 58.5 kN, C0 48 kN, Pu 6.2 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 370 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ306-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ306-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP306-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU306",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ306-ECP",
      "SKF NJ 306 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ307-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 307 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 21,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 75,
    "static_load_kN": 63,
    "fatigue_load_limit_kN": 8.15,
    "max_rpm": 11000,
    "reference_speed_rpm": 9500,
    "limiting_speed_rpm": 11000,
    "weight_g": 490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ307-ECP is the 35 mm bore entry in the NJ300 range: a 35×80×21 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 75 kN / C0 63 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 22.5 mm and the catalogue mass 490 g; at 75 kN dynamic rating this is roughly 2.14 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 307, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 307 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.",
      "The 75/63 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ307-ECP?",
        "a": "SKF NJ 307 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 80 mm OD and 21 mm width per ISO 15. SKF lists C 75 kN, C0 63 kN, Pu 8.15 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 490 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ307-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ307-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP307-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU307",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ307-ECP",
      "SKF NJ 307 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ308-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 308 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 93,
    "static_load_kN": 78,
    "fatigue_load_limit_kN": 10.2,
    "max_rpm": 9500,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 9500,
    "weight_g": 670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 40 mm shaft, SKF lists NJ308-ECP as single-row caged cylindrical roller: 90 mm OD, 23 mm wide, Pu 10.2 kN, the catalogue lists 8,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ308-ECP: the catalogue lists 8,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The mass entry 670 g covers the complete catalogue execution. Fit practice for NJ308-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 308, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 308 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.",
      "The 93/78 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ308-ECP?",
        "a": "SKF NJ 308 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 90 mm OD and 23 mm width per ISO 15. SKF lists C 93 kN, C0 78 kN, Pu 10.2 kN, reference speed 8,000 r/min and limiting speed 9,500 r/min, mass about 670 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ308-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ308-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ308",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP308-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU308",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ308-ECP",
      "SKF NJ 308 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ309-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 309 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 112,
    "static_load_kN": 100,
    "fatigue_load_limit_kN": 12.9,
    "max_rpm": 8500,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 8500,
    "weight_g": 890,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 45 mm shaft, SKF lists NJ309-ECP as single-row caged cylindrical roller: 100 mm OD, 25 mm wide, Pu 12.9 kN, the catalogue lists 7,500 r/min thermal reference speed and 8,500 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 45 mm seat is about 2.49 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 100 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 309, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 309 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.",
      "The 112/100 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ309-ECP?",
        "a": "SKF NJ 309 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 112 kN, C0 100 kN, Pu 12.9 kN, reference speed 7,500 r/min and limiting speed 8,500 r/min, mass about 890 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ309-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ309-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ309",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP309-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU309",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ309-ECP",
      "SKF NJ 309 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ310-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 310 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 127,
    "static_load_kN": 112,
    "fatigue_load_limit_kN": 15,
    "max_rpm": 8000,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 8000,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ310-ECP is the 50 mm bore entry in the NJ300 range: a 50×110×27 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 127 kN / C0 112 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 50 mm seat is about 2.54 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 112 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 50 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 310, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 310 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.",
      "The 127/112 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ310-ECP?",
        "a": "SKF NJ 310 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 110 mm OD and 27 mm width per ISO 15. SKF lists C 127 kN, C0 112 kN, Pu 15 kN, reference speed 6,700 r/min and limiting speed 8,000 r/min, mass about 1150 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ310-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ310-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ310",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP310-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU310",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ310-ECP",
      "SKF NJ 310 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ311-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 311 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 156,
    "static_load_kN": 143,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 7000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 7000,
    "weight_g": 1500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ311-ECP is the 55 mm bore entry in the NJ300 range: a 55×120×29 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 156 kN / C0 143 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.92 (143 against 156 kN), and the Pu figure 18.6 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,000 r/min thermal reference speed and 7,000 r/min mechanical limiting speed. Fit practice for NJ311-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 311, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 311 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 29 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.",
      "The 156/143 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ311-ECP?",
        "a": "SKF NJ 311 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 120 mm OD and 29 mm width per ISO 15. SKF lists C 156 kN, C0 143 kN, Pu 18.6 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 1500 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ311-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ311-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ311",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP311-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ311-ECP",
      "SKF NJ 311 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ312-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 312 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 173,
    "static_load_kN": 160,
    "fatigue_load_limit_kN": 21.2,
    "max_rpm": 6700,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6700,
    "weight_g": 1850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 60 mm shaft, SKF lists NJ312-ECP as single-row caged cylindrical roller: 130 mm OD, 31 mm wide, Pu 21.2 kN, the catalogue lists 5,600 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 35.0 mm and the catalogue mass 1850 g; at 173 kN dynamic rating this is roughly 2.88 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 312, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 312 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.",
      "The 173/160 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ312-ECP?",
        "a": "SKF NJ 312 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 130 mm OD and 31 mm width per ISO 15. SKF lists C 173 kN, C0 160 kN, Pu 21.2 kN, reference speed 5,600 r/min and limiting speed 6,700 r/min, mass about 1850 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ312-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ312-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ312",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP312-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU312",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ312-ECP",
      "SKF NJ 312 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ313-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 313 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 212,
    "static_load_kN": 196,
    "fatigue_load_limit_kN": 25.5,
    "max_rpm": 6000,
    "reference_speed_rpm": 5300,
    "limiting_speed_rpm": 6000,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 65 mm shaft, SKF lists NJ313-ECP as single-row caged cylindrical roller: 140 mm OD, 33 mm wide, Pu 25.5 kN, the catalogue lists 5,300 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 212 kN and C0 196 kN, size the bearing on the 65×140 mm ISO 15 envelope and check the 25.5 kN Pu against the equivalent-load floor; the catalogue lists 5,300 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. Fit practice for NJ313-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 313, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 313 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.",
      "The 212/196 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ313-ECP?",
        "a": "SKF NJ 313 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 140 mm OD and 33 mm width per ISO 15. SKF lists C 212 kN, C0 196 kN, Pu 25.5 kN, reference speed 5,300 r/min and limiting speed 6,000 r/min, mass about 2300 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ313-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ313-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ313",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N313-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP313-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU313",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ313-ECP",
      "SKF NJ 313 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ314-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 314 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 236,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 29,
    "max_rpm": 5600,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5600,
    "weight_g": 2750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 314 ECP is a single-row caged cylindrical roller bearing sized 70×150×35 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 70 mm seat is about 3.37 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 228 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 314, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 314 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.",
      "The 236/228 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ314-ECP?",
        "a": "SKF NJ 314 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 150 mm OD and 35 mm width per ISO 15. SKF lists C 236 kN, C0 228 kN, Pu 29 kN, reference speed 4,800 r/min and limiting speed 5,600 r/min, mass about 2750 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ314-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ314-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ314",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N314-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP314-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU314",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ314-ECP",
      "SKF NJ 314 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ315-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 315 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 280,
    "static_load_kN": 265,
    "fatigue_load_limit_kN": 33.5,
    "max_rpm": 5300,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 5300,
    "weight_g": 3350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 315 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 75×160×37 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 3350 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.95 (265 against 280 kN), and the Pu figure 33.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,500 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 315, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 315 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.",
      "The 280/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ315-ECP?",
        "a": "SKF NJ 315 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 160 mm OD and 37 mm width per ISO 15. SKF lists C 280 kN, C0 265 kN, Pu 33.5 kN, reference speed 4,500 r/min and limiting speed 5,300 r/min, mass about 3350 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ315-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ315-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ315",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N315-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP315-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU315",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ315-ECP",
      "SKF NJ 315 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ316-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 316 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 300,
    "static_load_kN": 290,
    "fatigue_load_limit_kN": 36,
    "max_rpm": 5000,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5000,
    "weight_g": 4000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 316 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 80×170×39 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 4000 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 45.0 mm and the catalogue mass 4000 g; at 300 kN dynamic rating this is roughly 3.75 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 316, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 316 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 39 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.",
      "The 300/290 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ316-ECP?",
        "a": "SKF NJ 316 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 170 mm OD and 39 mm width per ISO 15. SKF lists C 300 kN, C0 290 kN, Pu 36 kN, reference speed 4,300 r/min and limiting speed 5,000 r/min, mass about 4000 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ316-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ316-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ316",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N316-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP316-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU316",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ316-ECP",
      "SKF NJ 316 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ317-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 317 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 340,
    "static_load_kN": 335,
    "fatigue_load_limit_kN": 41.5,
    "max_rpm": 4800,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4800,
    "weight_g": 4800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 317 ECP resolves to a 85×180×41 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. With C 340 kN and C0 335 kN, size the bearing on the 85×180 mm ISO 15 envelope and check the 41.5 kN Pu against the equivalent-load floor; the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 317, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 317 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "The 340/335 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ317-ECP?",
        "a": "SKF NJ 317 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 180 mm OD and 41 mm width per ISO 15. SKF lists C 340 kN, C0 335 kN, Pu 41.5 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 4800 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ317-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ317-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ317",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N317-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP317-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ317-ECP",
      "SKF NJ 317 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ318-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 318 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 365,
    "static_load_kN": 360,
    "fatigue_load_limit_kN": 43,
    "max_rpm": 4500,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4500,
    "weight_g": 5450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 318 ECP resolves to a 90×190×43 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ318-ECP: the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 5450 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 318, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 318 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.",
      "The 365/360 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ318-ECP?",
        "a": "SKF NJ 318 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 190 mm OD and 43 mm width per ISO 15. SKF lists C 365 kN, C0 360 kN, Pu 43 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 5450 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ318-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ318-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ318",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N318-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP318-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU318",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ318-ECP",
      "SKF NJ 318 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ319-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 319 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 390,
    "static_load_kN": 390,
    "fatigue_load_limit_kN": 46.5,
    "max_rpm": 4300,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4300,
    "weight_g": 6300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ319-ECP is the 95 mm bore entry in the NJ300 range: a 95×200×45 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 390 kN / C0 390 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 95 mm seat is about 4.11 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 390 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 319, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 319 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "The 390/390 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ319-ECP?",
        "a": "SKF NJ 319 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 200 mm OD and 45 mm width per ISO 15. SKF lists C 390 kN, C0 390 kN, Pu 46.5 kN, reference speed 3,600 r/min and limiting speed 4,300 r/min, mass about 6300 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ319-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ319-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ319",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N319-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP319-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU319",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ319-ECP",
      "SKF NJ 319 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ320-ECJ",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 320 ECJ",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 450,
    "static_load_kN": 440,
    "fatigue_load_limit_kN": 51,
    "max_rpm": 3800,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 3800,
    "weight_g": 7650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ320-ECJ is the 100 mm bore entry in the NJ300 range: a 100×215×47 mm single-row caged cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 450 kN / C0 440 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.98 (440 against 450 kN), and the Pu figure 51 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 320, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 320 ECJ and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 47 mm-wide ring and concentrates load.",
      "The 450/440 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ320-ECJ?",
        "a": "SKF NJ 320 ECJ is a single-row caged cylindrical roller bearing with 100 mm bore, 215 mm OD and 47 mm width per ISO 15. SKF lists C 450 kN, C0 440 kN, Pu 51 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 7650 g."
      },
      {
        "q": "What does the NJ designation and ECJ suffix mean?",
        "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ320-ECJ take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ320-ECJ compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ320",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N320-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP320-ECJ",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ320-ECJ",
      "SKF NJ 320 ECJ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ321-ECP",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 321 ECP",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 105,
    "D_mm": 225,
    "B_mm": 49,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "polymer_PA66",
    "dynamic_load_kN": 500,
    "static_load_kN": 500,
    "fatigue_load_limit_kN": 57,
    "max_rpm": 3800,
    "reference_speed_rpm": 3200,
    "limiting_speed_rpm": 3800,
    "weight_g": 9050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 321 ECP resolves to a 105×225×49 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 500 kN and C0 500 kN, size the bearing on the 105×225 mm ISO 15 envelope and check the 57 kN Pu against the equivalent-load floor; the catalogue lists 3,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.",
    "applications": [
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "polymer cage softening above 120 °C",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 321, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 321 ECP and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 49 mm-wide ring and concentrates load.",
      "The 500/500 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ321-ECP?",
        "a": "SKF NJ 321 ECP is a single-row caged cylindrical roller bearing with 105 mm bore, 225 mm OD and 49 mm width per ISO 15. SKF lists C 500 kN, C0 500 kN, Pu 57 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 9050 g."
      },
      {
        "q": "What does the NJ designation and ECP suffix mean?",
        "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ321-ECP take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ321-ECP compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ321",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N321-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×225×49 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU321-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 105×225×49 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ321-ECP",
      "SKF NJ 321 ECP"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ322-ECJ",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 322 ECJ",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 530,
    "static_load_kN": 540,
    "fatigue_load_limit_kN": 61,
    "max_rpm": 3400,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3400,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 322 ECJ is a single-row caged cylindrical roller bearing sized 110×240×50 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Speed planning for NJ322-ECJ: the catalogue lists 3,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The mass entry 10500 g covers the complete catalogue execution. Fit practice for NJ322-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 322, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 322 ECJ and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 240 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.",
      "The 530/540 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ322-ECJ?",
        "a": "SKF NJ 322 ECJ is a single-row caged cylindrical roller bearing with 110 mm bore, 240 mm OD and 50 mm width per ISO 15. SKF lists C 530 kN, C0 540 kN, Pu 61 kN, reference speed 3,000 r/min and limiting speed 3,400 r/min, mass about 10500 g."
      },
      {
        "q": "What does the NJ designation and ECJ suffix mean?",
        "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ322-ECJ take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ322-ECJ compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ322",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N322-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU322-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP322-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ322-ECJ",
      "SKF NJ 322 ECJ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ324-ECJ",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 324 ECJ",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 610,
    "static_load_kN": 620,
    "fatigue_load_limit_kN": 69.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3200,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 324 ECJ denotes a single-row caged cylindrical roller bearing on the ISO 15 120×260×55 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 13500 g. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Selection arithmetic: C0/C ≈ 1.02 (620 against 610 kN), and the Pu figure 69.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,800 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Fit practice for NJ324-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 324, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 324 ECJ and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 55 mm-wide ring and concentrates load.",
      "The 610/620 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ324-ECJ?",
        "a": "SKF NJ 324 ECJ is a single-row caged cylindrical roller bearing with 120 mm bore, 260 mm OD and 55 mm width per ISO 15. SKF lists C 610 kN, C0 620 kN, Pu 69.5 kN, reference speed 2,800 r/min and limiting speed 3,200 r/min, mass about 13500 g."
      },
      {
        "q": "What does the NJ designation and ECJ suffix mean?",
        "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ324-ECJ take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ324-ECJ compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ324",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N324-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU324-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP324-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ324-ECJ",
      "SKF NJ 324 ECJ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ326-ECJ",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 326 ECJ",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 720,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 81.5,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 16500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 326 ECJ resolves to a 130×280×58 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECJ: the E-design execution with a pressed sheet-steel window cage, for positions where polymer cages are temperature- or lubricant-limited. The radial section height is 75.0 mm and the catalogue mass 16500 g; at 720 kN dynamic rating this is roughly 5.54 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 326, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 326 ECJ and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 720/750 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ326-ECJ?",
        "a": "SKF NJ 326 ECJ is a single-row caged cylindrical roller bearing with 130 mm bore, 280 mm OD and 58 mm width per ISO 15. SKF lists C 720 kN, C0 750 kN, Pu 81.5 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 16500 g."
      },
      {
        "q": "What does the NJ designation and ECJ suffix mean?",
        "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ326-ECJ take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ326-ECJ compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ326",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "N326-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NU326-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP326-ECP",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ326-ECJ",
      "SKF NJ 326 ECJ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ328-ECJ",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 328 ECJ",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 780,
    "static_load_kN": 830,
    "fatigue_load_limit_kN": 88,
    "max_rpm": 2800,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 2800,
    "weight_g": 20000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ328-ECJ is the 140 mm bore entry in the NJ300 range: a 140×300×62 mm single-row caged cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 780 kN / C0 830 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECJ: the E-design execution with a pressed sheet-steel window cage, for positions where polymer cages are temperature- or lubricant-limited. Load-per-bore for the 140 mm seat is about 5.57 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 830 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 140 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 328, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 328 ECJ and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 62 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 780/830 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ328-ECJ?",
        "a": "SKF NJ 328 ECJ is a single-row caged cylindrical roller bearing with 140 mm bore, 300 mm OD and 62 mm width per ISO 15. SKF lists C 780 kN, C0 830 kN, Pu 88 kN, reference speed 2,400 r/min and limiting speed 2,800 r/min, mass about 20000 g."
      },
      {
        "q": "What does the NJ designation and ECJ suffix mean?",
        "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ328-ECJ take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ328-ECJ compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ328",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU328-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×300×62 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NUP328-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×300×62 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ328-ECJ",
      "SKF NJ 328 ECJ"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ330-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 330 ECML",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 900,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 4000,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 4000,
    "weight_g": 26500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ330-ECML is the 150 mm bore entry in the NJ300 range: a 150×320×65 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 900 kN / C0 965 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Speed planning for NJ330-ECML: the catalogue lists 2,200 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The mass entry 26500 g covers the complete catalogue execution. Fit practice for NJ330-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 330, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 330 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "The 900/965 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ330-ECML?",
        "a": "SKF NJ 330 ECML is a single-row caged cylindrical roller bearing with 150 mm bore, 320 mm OD and 65 mm width per ISO 15. SKF lists C 900 kN, C0 965 kN, Pu 100 kN, reference speed 2,200 r/min and limiting speed 4,000 r/min, mass about 26500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ330-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ330-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ330",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 150×320×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU330-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×320×65 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ330-ECML",
      "SKF NJ 330 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ332-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 332 ECML",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 112,
    "max_rpm": 3600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 3600,
    "weight_g": 31000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 332 ECML is a single-row caged cylindrical roller bearing sized 160×340×68 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.08 (1080 against 1000 kN), and the Pu figure 112 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. Fit practice for NJ332-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 332, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 332 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.",
      "The 1000/1080 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ332-ECML?",
        "a": "SKF NJ 332 ECML is a single-row caged cylindrical roller bearing with 160 mm bore, 340 mm OD and 68 mm width per ISO 15. SKF lists C 1000 kN, C0 1080 kN, Pu 112 kN, reference speed 2,000 r/min and limiting speed 3,600 r/min, mass about 31000 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ332-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ332-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ332",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 160×340×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU332-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×340×68 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ332-ECML",
      "SKF NJ 332 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ336-ECM",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 336 ECM",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 125,
    "max_rpm": 2200,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2200,
    "weight_g": 44000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 336 ECM is a single-row caged cylindrical roller bearing sized 180×380×75 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECM: the E-design ECM execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Speed planning for NJ336-ECM: the catalogue lists 1,600 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. The mass entry 44000 g covers the complete catalogue execution. Fit practice for NJ336-ECM: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains",
      "marine propulsion line shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 336, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 336 ECM and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.",
      "The 1020/1290 kN ratings are SKF catalogue 17000 (2018) values for the ECM execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ336-ECM?",
        "a": "SKF NJ 336 ECM is a single-row caged cylindrical roller bearing with 180 mm bore, 380 mm OD and 75 mm width per ISO 15. SKF lists C 1020 kN, C0 1290 kN, Pu 125 kN, reference speed 1,600 r/min and limiting speed 2,200 r/min, mass about 44000 g."
      },
      {
        "q": "What does the NJ designation and ECM suffix mean?",
        "a": "The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ336-ECM take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ336-ECM compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ336",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 180×380×75 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU336-ECM",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×380×75 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ336-ECM",
      "SKF NJ 336 ECM"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ340-ECML",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 340 ECML",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1230,
    "static_load_kN": 1630,
    "fatigue_load_limit_kN": 150,
    "max_rpm": 2800,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 2800,
    "weight_g": 56500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 340 ECML resolves to a 200×420×80 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.33 (1630 against 1230 kN), and the Pu figure 150 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,400 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Fit practice for NJ340-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill drive trains",
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 340, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 340 ECML and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "The 1230/1630 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ340-ECML?",
        "a": "SKF NJ 340 ECML is a single-row caged cylindrical roller bearing with 200 mm bore, 420 mm OD and 80 mm width per ISO 15. SKF lists C 1230 kN, C0 1630 kN, Pu 150 kN, reference speed 1,400 r/min and limiting speed 2,800 r/min, mass about 56500 g."
      },
      {
        "q": "What does the NJ designation and ECML suffix mean?",
        "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ340-ECML take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ340-ECML compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ340",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 200×420×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU340-ECML",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×420×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ340-ECML",
      "SKF NJ 340 ECML"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ344-M",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 344 M",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1210,
    "static_load_kN": 1630,
    "fatigue_load_limit_kN": 150,
    "max_rpm": 1700,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1700,
    "weight_g": 73500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 220 mm shaft, SKF lists NJ344-M as single-row caged cylindrical roller: 460 mm OD, 88 mm wide, Pu 150 kN, the catalogue lists 1,500 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix M: the basic (non-E) M execution with a machined brass cage, standard for the larger and earlier-design sizes. With C 1210 kN and C0 1630 kN, size the bearing on the 220×460 mm ISO 15 envelope and check the 150 kN Pu against the equivalent-load floor; the catalogue lists 1,500 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts",
      "large rolling-mill drive trains"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 344, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 344 M and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 88 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 88 mm-wide ring and concentrates load.",
      "The 1210/1630 kN ratings are SKF catalogue 17000 (2018) values for the M execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ344-M?",
        "a": "SKF NJ 344 M is a single-row caged cylindrical roller bearing with 220 mm bore, 460 mm OD and 88 mm width per ISO 15. SKF lists C 1210 kN, C0 1630 kN, Pu 150 kN, reference speed 1,500 r/min and limiting speed 1,700 r/min, mass about 73500 g."
      },
      {
        "q": "What does the NJ designation and M suffix mean?",
        "a": "The M suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ344-M take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ344-M compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ344",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU344-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×460×88 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ344-M",
      "SKF NJ 344 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ348-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 348 MA",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 1450,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 180,
    "max_rpm": 2000,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 2000,
    "weight_g": 98500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 348 MA is a single-row caged cylindrical roller bearing sized 240×500×95 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. The radial section height is 130.0 mm and the catalogue mass 98500 g; at 1450 kN dynamic rating this is roughly 6.04 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "marine propulsion line shafts",
      "heavy turbogenerator rotor supports",
      "mining hoist and winder shafts",
      "offshore drawworks shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 348, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 348 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.",
      "The 1450/2000 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ348-MA?",
        "a": "SKF NJ 348 MA is a single-row caged cylindrical roller bearing with 240 mm bore, 500 mm OD and 95 mm width per ISO 15. SKF lists C 1450 kN, C0 2000 kN, Pu 180 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 98500 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ348-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ348-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ348",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU348-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 240×500×95 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ348-MA",
      "SKF NJ 348 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ406-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 406 MA",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 60.5,
    "static_load_kN": 53,
    "fatigue_load_limit_kN": 6.8,
    "max_rpm": 11000,
    "reference_speed_rpm": 9000,
    "limiting_speed_rpm": 11000,
    "weight_g": 780,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 30 mm shaft, SKF lists NJ406-MA as single-row caged cylindrical roller: 90 mm OD, 23 mm wide, Pu 6.8 kN, the catalogue lists 9,000 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 60.5 kN and C0 53 kN, size the bearing on the 30×90 mm ISO 15 envelope and check the 6.8 kN Pu against the equivalent-load floor; the catalogue lists 9,000 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. Fit practice for NJ406-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 406, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 406 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 60.5/53 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ406-MA?",
        "a": "SKF NJ 406 MA is a single-row caged cylindrical roller bearing with 30 mm bore, 90 mm OD and 23 mm width per ISO 15. SKF lists C 60.5 kN, C0 53 kN, Pu 6.8 kN, reference speed 9,000 r/min and limiting speed 11,000 r/min, mass about 780 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ406-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ406-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ406",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 30×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU406-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 30×90×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ406-MA",
      "SKF NJ 406 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ407",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 407",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 76.5,
    "static_load_kN": 69.5,
    "fatigue_load_limit_kN": 9,
    "max_rpm": 9500,
    "reference_speed_rpm": 8000,
    "limiting_speed_rpm": 9500,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 407 resolves to a 35×100×25 mm single-row caged cylindrical roller bearing (dimension series 4 (heavy-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. The radial section height is 32.5 mm and the catalogue mass 1000 g; at 76.5 kN dynamic rating this is roughly 2.19 kN of C per millimetre of bore before application factors. Fit practice for NJ407: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 407, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 407 and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 76.5/69.5 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ407?",
        "a": "SKF NJ 407 is a single-row caged cylindrical roller bearing with 35 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 76.5 kN, C0 69.5 kN, Pu 9 kN, reference speed 8,000 r/min and limiting speed 9,500 r/min, mass about 1000 g."
      },
      {
        "q": "What does the NJ designation and plain suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ407 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ407 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ407-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU407",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 35×100×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ407",
      "SKF NJ 407"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ408-M",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 408 M",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 96.8,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 11.6,
    "max_rpm": 8500,
    "reference_speed_rpm": 7000,
    "limiting_speed_rpm": 8500,
    "weight_g": 1300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ408-M is the 40 mm bore entry in the NJ400 range: a 40×110×27 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 96.8 kN / C0 90 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix M: the basic (non-E) M execution with a machined brass cage, standard for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 0.93 (90 against 96.8 kN), and the Pu figure 11.6 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 7,000 r/min thermal reference speed and 8,500 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 408, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 408 M and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 96.8/90 kN ratings are SKF catalogue 17000 (2018) values for the M execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ408-M?",
        "a": "SKF NJ 408 M is a single-row caged cylindrical roller bearing with 40 mm bore, 110 mm OD and 27 mm width per ISO 15. SKF lists C 96.8 kN, C0 90 kN, Pu 11.6 kN, reference speed 7,000 r/min and limiting speed 8,500 r/min, mass about 1300 g."
      },
      {
        "q": "What does the NJ designation and M suffix mean?",
        "a": "The M suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ408-M take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ408-M compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ408",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU408-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 40×110×27 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ408-M",
      "SKF NJ 408 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ409",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 409",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 106,
    "static_load_kN": 102,
    "fatigue_load_limit_kN": 13.4,
    "max_rpm": 7500,
    "reference_speed_rpm": 6700,
    "limiting_speed_rpm": 7500,
    "weight_g": 1650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ409 is the 45 mm bore entry in the NJ400 range: a 45×120×29 mm single-row caged cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 106 kN / C0 102 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. The radial section height is 37.5 mm and the catalogue mass 1650 g; at 106 kN dynamic rating this is roughly 2.36 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 45 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "electric-motor shafts in pumps and fans",
      "compressor crank and rotor shafts",
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 409, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 409 and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 29 mm-wide ring and concentrates load.",
      "The 106/102 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ409?",
        "a": "SKF NJ 409 is a single-row caged cylindrical roller bearing with 45 mm bore, 120 mm OD and 29 mm width per ISO 15. SKF lists C 106 kN, C0 102 kN, Pu 13.4 kN, reference speed 6,700 r/min and limiting speed 7,500 r/min, mass about 1650 g."
      },
      {
        "q": "What does the NJ designation and plain suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ409 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ409 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ409-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same 45×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "NU409",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 45×120×29 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ409",
      "SKF NJ 409"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ410",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 410",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 50,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 130,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 16.6,
    "max_rpm": 7000,
    "reference_speed_rpm": 6000,
    "limiting_speed_rpm": 7000,
    "weight_g": 2050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 50 mm shaft, SKF lists NJ410 as single-row caged cylindrical roller: 130 mm OD, 31 mm wide, Pu 16.6 kN, the catalogue lists 6,000 r/min thermal reference speed and 7,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ410: the catalogue lists 6,000 r/min thermal reference speed and 7,000 r/min mechanical limiting speed. The mass entry 2050 g covers the complete catalogue execution. Fit practice for NJ410: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 410, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 410 and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 130/127 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ410?",
        "a": "SKF NJ 410 is a single-row caged cylindrical roller bearing with 50 mm bore, 130 mm OD and 31 mm width per ISO 15. SKF lists C 130 kN, C0 127 kN, Pu 16.6 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 2050 g."
      },
      {
        "q": "What does the NJ designation and plain suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ410 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ410 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ410-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU410",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 50×130×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ410",
      "SKF NJ 410"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ411",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 411",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 142,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 18.6,
    "max_rpm": 6300,
    "reference_speed_rpm": 5600,
    "limiting_speed_rpm": 6300,
    "weight_g": 2550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 411 resolves to a 55×140×33 mm single-row caged cylindrical roller bearing (dimension series 4 (heavy-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ411: the catalogue lists 5,600 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. The mass entry 2550 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "machine-tool radial spindle supports",
      "conveyor drive-pulley shafts",
      "medium industrial gearbox shafts",
      "electric-motor shafts in pumps and fans"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 411, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 411 and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 33 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.",
      "The 142/140 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ411?",
        "a": "SKF NJ 411 is a single-row caged cylindrical roller bearing with 55 mm bore, 140 mm OD and 33 mm width per ISO 15. SKF lists C 142 kN, C0 140 kN, Pu 18.6 kN, reference speed 5,600 r/min and limiting speed 6,300 r/min, mass about 2550 g."
      },
      {
        "q": "What does the NJ designation and plain suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ411 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ411 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ411-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU411",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 55×140×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ411",
      "SKF NJ 411"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ412",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 412",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 168,
    "static_load_kN": 173,
    "fatigue_load_limit_kN": 22,
    "max_rpm": 6000,
    "reference_speed_rpm": 5000,
    "limiting_speed_rpm": 6000,
    "weight_g": 3050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJ 412 is a single-row caged cylindrical roller bearing sized 60×150×35 mm — a dimension series 4 (heavy-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ412: the catalogue lists 5,000 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The mass entry 3050 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 412, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 412 and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 35 mm-wide ring and concentrates load.",
      "The 168/173 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ412?",
        "a": "SKF NJ 412 is a single-row caged cylindrical roller bearing with 60 mm bore, 150 mm OD and 35 mm width per ISO 15. SKF lists C 168 kN, C0 173 kN, Pu 22 kN, reference speed 5,000 r/min and limiting speed 6,000 r/min, mass about 3050 g."
      },
      {
        "q": "What does the NJ designation and plain suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ412 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ412 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ412-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU412",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×150×35 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ412",
      "SKF NJ 412"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ413",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 413",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 183,
    "static_load_kN": 190,
    "fatigue_load_limit_kN": 24,
    "max_rpm": 5600,
    "reference_speed_rpm": 4800,
    "limiting_speed_rpm": 5600,
    "weight_g": 3650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ413 is the 65 mm bore entry in the NJ400 range: a 65×160×37 mm single-row caged cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 183 kN / C0 190 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ413: the catalogue lists 4,800 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. The mass entry 3650 g covers the complete catalogue execution. Fit practice for NJ413: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 413, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 413 and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 183/190 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ413?",
        "a": "SKF NJ 413 is a single-row caged cylindrical roller bearing with 65 mm bore, 160 mm OD and 37 mm width per ISO 15. SKF lists C 183 kN, C0 190 kN, Pu 24 kN, reference speed 4,800 r/min and limiting speed 5,600 r/min, mass about 3650 g."
      },
      {
        "q": "What does the NJ designation and plain suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ413 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ413 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ413-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU413",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 65×160×37 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ413",
      "SKF NJ 413"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ414-MA",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 414 MA",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 180,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 229,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 30,
    "max_rpm": 5000,
    "reference_speed_rpm": 4300,
    "limiting_speed_rpm": 5000,
    "weight_g": 5450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 414 MA resolves to a 70×180×42 mm single-row caged cylindrical roller bearing (dimension series 4 (heavy-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Load-per-bore for the 70 mm seat is about 3.27 kN/mm, typical of dimension series 4 (heavy-section ISO 15 envelope); use C0 240 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 414, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 414 MA and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.",
      "The 229/240 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ414-MA?",
        "a": "SKF NJ 414 MA is a single-row caged cylindrical roller bearing with 70 mm bore, 180 mm OD and 42 mm width per ISO 15. SKF lists C 229 kN, C0 240 kN, Pu 30 kN, reference speed 4,300 r/min and limiting speed 5,000 r/min, mass about 5450 g."
      },
      {
        "q": "What does the NJ designation and MA suffix mean?",
        "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ414-MA take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ414-MA compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ414",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU414-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×180×42 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ414-MA",
      "SKF NJ 414 MA"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ415",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 415",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 190,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 264,
    "static_load_kN": 280,
    "fatigue_load_limit_kN": 34,
    "max_rpm": 4800,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4800,
    "weight_g": 6400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 75 mm shaft, SKF lists NJ415 as single-row caged cylindrical roller: 190 mm OD, 45 mm wide, Pu 34 kN, the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ415: the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 6400 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 75 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 415, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 415 and do not substitute rib styles without checking the shaft locating scheme.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.",
      "The 264/280 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ415?",
        "a": "SKF NJ 415 is a single-row caged cylindrical roller bearing with 75 mm bore, 190 mm OD and 45 mm width per ISO 15. SKF lists C 264 kN, C0 280 kN, Pu 34 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 6400 g."
      },
      {
        "q": "What does the NJ designation and plain suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ415 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ415 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ415-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU415",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 75×190×45 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ415",
      "SKF NJ 415"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ416",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 416",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 200,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 303,
    "static_load_kN": 320,
    "fatigue_load_limit_kN": 39,
    "max_rpm": 4500,
    "reference_speed_rpm": 3800,
    "limiting_speed_rpm": 4500,
    "weight_g": 7550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJ 416 resolves to a 80×200×48 mm single-row caged cylindrical roller bearing (dimension series 4 (heavy-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ416: the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 7550 g covers the complete catalogue execution. Fit practice for NJ416: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "paper-machine press rolls",
      "cement-plant conveyor drives",
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 416, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 416 and do not substitute rib styles without checking the shaft locating scheme.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 303/320 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ416?",
        "a": "SKF NJ 416 is a single-row caged cylindrical roller bearing with 80 mm bore, 200 mm OD and 48 mm width per ISO 15. SKF lists C 303 kN, C0 320 kN, Pu 39 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 7550 g."
      },
      {
        "q": "What does the NJ designation and plain suffix mean?",
        "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ416 take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ416 compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ416-NTN",
        "equiv_brand": "NTN",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU416",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×200×48 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ416",
      "SKF NJ 416"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ422-M",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJ 422 M",
    "series": "NJ400-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 280,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass",
    "dynamic_load_kN": 550,
    "static_load_kN": 630,
    "fatigue_load_limit_kN": 69.5,
    "max_rpm": 3200,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3200,
    "weight_g": 22500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 422 M denotes a single-row caged cylindrical roller bearing on the ISO 15 110×280×65 mm envelope, dimension series 4 (heavy-section ISO 15 envelope), with catalogue mass 22500 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The M suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.15 (630 against 550 kN), and the Pu figure 69.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,600 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.",
    "applications": [
      "heavy gearbox and pinion shafts",
      "large pump and blower rotors",
      "rolling-mill auxiliary drive shafts",
      "paper-machine press rolls"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "cage pocket wear from roller skew at light load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring",
      "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 422, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 422 M and do not substitute rib styles without checking the shaft locating scheme.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 65 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.",
      "The 550/630 kN ratings are SKF catalogue 17000 (2018) values for the M execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ422-M?",
        "a": "SKF NJ 422 M is a single-row caged cylindrical roller bearing with 110 mm bore, 280 mm OD and 65 mm width per ISO 15. SKF lists C 550 kN, C0 630 kN, Pu 69.5 kN, reference speed 2,600 r/min and limiting speed 3,200 r/min, mass about 22500 g."
      },
      {
        "q": "What does the NJ designation and M suffix mean?",
        "a": "The M suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set."
      },
      {
        "q": "Can NJ422-M take axial load and locate the shaft?",
        "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location."
      },
      {
        "q": "How does NJ422-M compare with the other executions in the same envelope?",
        "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ422",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJ422-M",
      "SKF NJ 422 M"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2305-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2305 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 25,
    "D_mm": 62,
    "B_mm": 24,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 68.2,
    "static_load_kN": 68,
    "fatigue_load_limit_kN": 8.5,
    "max_rpm": 5600,
    "reference_speed_rpm": 4500,
    "limiting_speed_rpm": 5600,
    "weight_g": 380,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJG 2305 VH resolves to a 25×62×24 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 18.5 mm and the catalogue mass 380 g; at 68.2 kN dynamic rating this is roughly 2.73 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "small gearbox low-speed shafts",
      "machine-tool indexing drives",
      "crane trolley wheel hubs"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 5,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.",
      "The 68.2/68 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2305-VH?",
        "a": "SKF NJG 2305 VH is a single-row full-complement cylindrical roller bearing with 25 mm bore, 62 mm OD and 24 mm width per ISO 15. SKF lists C 68.2 kN, C0 68 kN, Pu 8.5 kN, reference speed 4,500 r/min and limiting speed 5,600 r/min, mass about 380 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2305-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2305-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2305",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2305-VH",
      "SKF NJG 2305 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2306-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2306 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 30,
    "D_mm": 72,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 84.2,
    "static_load_kN": 86.5,
    "fatigue_load_limit_kN": 11,
    "max_rpm": 4800,
    "reference_speed_rpm": 4000,
    "limiting_speed_rpm": 4800,
    "weight_g": 560,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJG2306-VH is the 30 mm bore entry in the NJG2300 range: a 30×72×27 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 84.2 kN / C0 86.5 kN. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NJG2306-VH: the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 560 g covers the complete catalogue execution. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 30 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "slew and swing drives",
      "heavy gearbox output shafts",
      "crane travel-wheel bearings",
      "rolling-mill table rollers"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 4,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 27 mm-wide ring and concentrates load.",
      "The 84.2/86.5 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2306-VH?",
        "a": "SKF NJG 2306 VH is a single-row full-complement cylindrical roller bearing with 30 mm bore, 72 mm OD and 27 mm width per ISO 15. SKF lists C 84.2 kN, C0 86.5 kN, Pu 11 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 560 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2306-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2306-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2306",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2306-VH",
      "SKF NJG 2306 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2307-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2307 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 35,
    "D_mm": 80,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 108,
    "static_load_kN": 114,
    "fatigue_load_limit_kN": 14.3,
    "max_rpm": 4300,
    "reference_speed_rpm": 3400,
    "limiting_speed_rpm": 4300,
    "weight_g": 750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 35 mm shaft, SKF lists NJG2307-VH as single-row full-complement cylindrical roller: 80 mm OD, 31 mm wide, Pu 14.3 kN, the catalogue lists 3,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.06 (114 against 108 kN), and the Pu figure 14.3 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Fit practice for NJG2307-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy gearbox output shafts",
      "crane travel-wheel bearings",
      "rolling-mill table rollers",
      "slew and swing drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 4,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 108/114 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2307-VH?",
        "a": "SKF NJG 2307 VH is a single-row full-complement cylindrical roller bearing with 35 mm bore, 80 mm OD and 31 mm width per ISO 15. SKF lists C 108 kN, C0 114 kN, Pu 14.3 kN, reference speed 3,400 r/min and limiting speed 4,300 r/min, mass about 750 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2307-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2307-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2307",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2307-VH",
      "SKF NJG 2307 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2308-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2308 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 145,
    "static_load_kN": 156,
    "fatigue_load_limit_kN": 20,
    "max_rpm": 3600,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3600,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJG 2308 VH is a single-row full-complement cylindrical roller bearing sized 40×90×33 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NJG2308-VH: the catalogue lists 3,000 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 1000 g covers the complete catalogue execution. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.",
    "applications": [
      "rolling-mill table rollers",
      "slew and swing drives",
      "heavy gearbox output shafts",
      "crane travel-wheel bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 145/156 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2308-VH?",
        "a": "SKF NJG 2308 VH is a single-row full-complement cylindrical roller bearing with 40 mm bore, 90 mm OD and 33 mm width per ISO 15. SKF lists C 145 kN, C0 156 kN, Pu 20 kN, reference speed 3,000 r/min and limiting speed 3,600 r/min, mass about 1000 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2308-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2308-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2308",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2308-VH",
      "SKF NJG 2308 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2309-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2309 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 172,
    "static_load_kN": 196,
    "fatigue_load_limit_kN": 25.5,
    "max_rpm": 3400,
    "reference_speed_rpm": 2800,
    "limiting_speed_rpm": 3400,
    "weight_g": 1400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJG 2309 VH denotes a single-row full-complement cylindrical roller bearing on the ISO 15 45×100×36 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 1400 g. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.14 (196 against 172 kN), and the Pu figure 25.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,800 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Fit practice for NJG2309-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "slew and swing drives",
      "heavy gearbox output shafts",
      "crane travel-wheel bearings",
      "rolling-mill table rollers"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 3,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "The 172/196 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2309-VH?",
        "a": "SKF NJG 2309 VH is a single-row full-complement cylindrical roller bearing with 45 mm bore, 100 mm OD and 36 mm width per ISO 15. SKF lists C 172 kN, C0 196 kN, Pu 25.5 kN, reference speed 2,800 r/min and limiting speed 3,400 r/min, mass about 1400 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2309-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2309-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2309",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2309-VH",
      "SKF NJG 2309 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2311-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2311 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 233,
    "static_load_kN": 260,
    "fatigue_load_limit_kN": 33.5,
    "max_rpm": 2800,
    "reference_speed_rpm": 2200,
    "limiting_speed_rpm": 2800,
    "weight_g": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJG2311-VH is the 55 mm bore entry in the NJG2300 range: a 55×120×43 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 233 kN / C0 260 kN. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 233 kN and C0 260 kN, size the bearing on the 55×120 mm ISO 15 envelope and check the 33.5 kN Pu against the equivalent-load floor; the catalogue lists 2,200 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 55 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "slew and swing drives",
      "heavy gearbox output shafts",
      "crane travel-wheel bearings",
      "rolling-mill table rollers"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.",
      "The 233/260 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2311-VH?",
        "a": "SKF NJG 2311 VH is a single-row full-complement cylindrical roller bearing with 55 mm bore, 120 mm OD and 43 mm width per ISO 15. SKF lists C 233 kN, C0 260 kN, Pu 33.5 kN, reference speed 2,200 r/min and limiting speed 2,800 r/min, mass about 2300 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2311-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2311-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2311",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2311-VH",
      "SKF NJG 2311 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2313-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2313 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 303,
    "static_load_kN": 360,
    "fatigue_load_limit_kN": 46.5,
    "max_rpm": 2400,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2400,
    "weight_g": 3550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJG 2313 VH is a single-row full-complement cylindrical roller bearing sized 65×140×48 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 303 kN and C0 360 kN, size the bearing on the 65×140 mm ISO 15 envelope and check the 46.5 kN Pu against the equivalent-load floor; the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 65 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 303/360 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2313-VH?",
        "a": "SKF NJG 2313 VH is a single-row full-complement cylindrical roller bearing with 65 mm bore, 140 mm OD and 48 mm width per ISO 15. SKF lists C 303 kN, C0 360 kN, Pu 46.5 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 3550 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2313-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2313-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2313",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2313-VH",
      "SKF NJG 2313 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2314-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2314 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 336,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 50,
    "max_rpm": 2200,
    "reference_speed_rpm": 1800,
    "limiting_speed_rpm": 2200,
    "weight_g": 4400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJG 2314 VH denotes a single-row full-complement cylindrical roller bearing on the ISO 15 70×150×51 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 4400 g. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 70 mm seat is about 4.80 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 400 kN for static checks such as crane hook blocks standing under load. Fit practice for NJG2314-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 51 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.",
      "The 336/400 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2314-VH?",
        "a": "SKF NJG 2314 VH is a single-row full-complement cylindrical roller bearing with 70 mm bore, 150 mm OD and 51 mm width per ISO 15. SKF lists C 336 kN, C0 400 kN, Pu 50 kN, reference speed 1,800 r/min and limiting speed 2,200 r/min, mass about 4400 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2314-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2314-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2314",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2314-VH",
      "SKF NJG 2314 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2315-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2315 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 396,
    "static_load_kN": 480,
    "fatigue_load_limit_kN": 60,
    "max_rpm": 2000,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2000,
    "weight_g": 5350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJG 2315 VH resolves to a 75×160×55 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 396 kN and C0 480 kN, size the bearing on the 75×160 mm ISO 15 envelope and check the 60 kN Pu against the equivalent-load floor; the catalogue lists 1,600 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 75 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 2,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 55 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.",
      "The 396/480 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2315-VH?",
        "a": "SKF NJG 2315 VH is a single-row full-complement cylindrical roller bearing with 75 mm bore, 160 mm OD and 55 mm width per ISO 15. SKF lists C 396 kN, C0 480 kN, Pu 60 kN, reference speed 1,600 r/min and limiting speed 2,000 r/min, mass about 5350 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2315-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2315-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2315",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2315-VH",
      "SKF NJG 2315 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2316-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2316 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 457,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 71,
    "max_rpm": 1900,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1900,
    "weight_g": 6400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJG2316-VH is the 80 mm bore entry in the NJG2300 range: a 80×170×58 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 457 kN / C0 570 kN. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 80 mm seat is about 5.71 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 570 kN for static checks such as crane hook blocks standing under load. Fit practice for NJG2316-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.",
      "The 457/570 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2316-VH?",
        "a": "SKF NJG 2316 VH is a single-row full-complement cylindrical roller bearing with 80 mm bore, 170 mm OD and 58 mm width per ISO 15. SKF lists C 457 kN, C0 570 kN, Pu 71 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 6400 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2316-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2316-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2316",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2316-VH",
      "SKF NJG 2316 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2317-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2317 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 484,
    "static_load_kN": 620,
    "fatigue_load_limit_kN": 76.5,
    "max_rpm": 1800,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1800,
    "weight_g": 7400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 85 mm shaft, SKF lists NJG2317-VH as single-row full-complement cylindrical roller: 180 mm OD, 60 mm wide, Pu 76.5 kN, the catalogue lists 1,400 r/min thermal reference speed and 1,800 r/min mechanical limiting speed. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 47.5 mm and the catalogue mass 7400 g; at 484 kN dynamic rating this is roughly 5.69 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 484/620 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2317-VH?",
        "a": "SKF NJG 2317 VH is a single-row full-complement cylindrical roller bearing with 85 mm bore, 180 mm OD and 60 mm width per ISO 15. SKF lists C 484 kN, C0 620 kN, Pu 76.5 kN, reference speed 1,400 r/min and limiting speed 1,800 r/min, mass about 7400 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2317-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2317-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2317",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2317-VH",
      "SKF NJG 2317 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2318-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2318 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 550,
    "static_load_kN": 680,
    "fatigue_load_limit_kN": 83,
    "max_rpm": 1700,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1700,
    "weight_g": 8750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJG 2318 VH is a single-row full-complement cylindrical roller bearing sized 90×190×64 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 90 mm seat is about 6.11 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 680 kN for static checks such as crane hook blocks standing under load. Fit practice for NJG2318-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 64 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 550/680 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2318-VH?",
        "a": "SKF NJG 2318 VH is a single-row full-complement cylindrical roller bearing with 90 mm bore, 190 mm OD and 64 mm width per ISO 15. SKF lists C 550 kN, C0 680 kN, Pu 83 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 8750 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2318-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2318-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2318",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2318-VH",
      "SKF NJG 2318 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2320-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2320 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 704,
    "static_load_kN": 900,
    "fatigue_load_limit_kN": 106,
    "max_rpm": 1500,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1500,
    "weight_g": 13000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJG2320-VH is the 100 mm bore entry in the NJG2300 range: a 100×215×73 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 704 kN / C0 900 kN. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 57.5 mm and the catalogue mass 13000 g; at 704 kN dynamic rating this is roughly 7.04 kN of C per millimetre of bore before application factors. Fit practice for NJG2320-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives",
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.",
      "The 704/900 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2320-VH?",
        "a": "SKF NJG 2320 VH is a single-row full-complement cylindrical roller bearing with 100 mm bore, 215 mm OD and 73 mm width per ISO 15. SKF lists C 704 kN, C0 900 kN, Pu 106 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 13000 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2320-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2320-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2320",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2320-VH",
      "SKF NJG 2320 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2322-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2322 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 858,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 122,
    "max_rpm": 1300,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1300,
    "weight_g": 17500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJG 2322 VH is a single-row full-complement cylindrical roller bearing sized 110×240×80 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.24 (1060 against 858 kN), and the Pu figure 122 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,100 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large gearbox slow-speed stages",
      "rolling-mill auxiliary shafts",
      "heavy conveyor pulley bearings",
      "wind turbine rotor-lock and yaw drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 858/1060 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2322-VH?",
        "a": "SKF NJG 2322 VH is a single-row full-complement cylindrical roller bearing with 110 mm bore, 240 mm OD and 80 mm width per ISO 15. SKF lists C 858 kN, C0 1060 kN, Pu 122 kN, reference speed 1,100 r/min and limiting speed 1,300 r/min, mass about 17500 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2322-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2322-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2322",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2322-VH",
      "SKF NJG 2322 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2324-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2324 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 952,
    "static_load_kN": 1250,
    "fatigue_load_limit_kN": 140,
    "max_rpm": 1200,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1200,
    "weight_g": 22500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJG 2324 VH resolves to a 120×260×86 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.31 (1250 against 952 kN), and the Pu figure 140 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,000 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.",
      "The 952/1250 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2324-VH?",
        "a": "SKF NJG 2324 VH is a single-row full-complement cylindrical roller bearing with 120 mm bore, 260 mm OD and 86 mm width per ISO 15. SKF lists C 952 kN, C0 1250 kN, Pu 140 kN, reference speed 1,000 r/min and limiting speed 1,200 r/min, mass about 22500 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2324-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2324-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2324",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2324-VH",
      "SKF NJG 2324 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2326-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2326 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1430,
    "fatigue_load_limit_kN": 156,
    "max_rpm": 1200,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1200,
    "weight_g": 28000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 130 mm shaft, SKF lists NJG2326-VH as single-row full-complement cylindrical roller: 280 mm OD, 93 mm wide, Pu 156 kN, the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.32 (1430 against 1080 kN), and the Pu figure 156 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 93 mm-wide ring and concentrates load.",
      "The 1080/1430 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2326-VH?",
        "a": "SKF NJG 2326 VH is a single-row full-complement cylindrical roller bearing with 130 mm bore, 280 mm OD and 93 mm width per ISO 15. SKF lists C 1080 kN, C0 1430 kN, Pu 156 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 28000 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2326-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2326-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2326",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2326-VH",
      "SKF NJG 2326 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2328-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2328 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1230,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 180,
    "max_rpm": 1100,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1100,
    "weight_g": 35500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJG 2328 VH denotes a single-row full-complement cylindrical roller bearing on the ISO 15 140×300×102 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 35500 g. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.35 (1660 against 1230 kN), and the Pu figure 180 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 140 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1230/1660 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2328-VH?",
        "a": "SKF NJG 2328 VH is a single-row full-complement cylindrical roller bearing with 140 mm bore, 300 mm OD and 102 mm width per ISO 15. SKF lists C 1230 kN, C0 1660 kN, Pu 180 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 35500 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2328-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2328-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2328",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2328-VH",
      "SKF NJG 2328 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2330-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2330 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1450,
    "static_load_kN": 1930,
    "fatigue_load_limit_kN": 196,
    "max_rpm": 1000,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1000,
    "weight_g": 42500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 150 mm shaft, SKF lists NJG2330-VH as single-row full-complement cylindrical roller: 320 mm OD, 108 mm wide, Pu 196 kN, the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1450 kN and C0 1930 kN, size the bearing on the 150×320 mm ISO 15 envelope and check the 196 kN Pu against the equivalent-load floor; the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 150 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 1,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "The 1450/1930 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2330-VH?",
        "a": "SKF NJG 2330 VH is a single-row full-complement cylindrical roller bearing with 150 mm bore, 320 mm OD and 108 mm width per ISO 15. SKF lists C 1450 kN, C0 1930 kN, Pu 196 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 42500 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2330-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2330-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2330",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2330-VH",
      "SKF NJG 2330 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2334-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2334 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1760,
    "static_load_kN": 2450,
    "fatigue_load_limit_kN": 236,
    "max_rpm": 900,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 900,
    "weight_g": 59500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJG2334-VH is the 170 mm bore entry in the NJG2300 range: a 170×360×120 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1760 kN / C0 2450 kN. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 95.0 mm and the catalogue mass 59500 g; at 1760 kN dynamic rating this is roughly 10.35 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining crusher eccentric shafts",
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.",
      "The 1760/2450 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2334-VH?",
        "a": "SKF NJG 2334 VH is a single-row full-complement cylindrical roller bearing with 170 mm bore, 360 mm OD and 120 mm width per ISO 15. SKF lists C 1760 kN, C0 2450 kN, Pu 236 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 59500 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2334-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2334-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2334-VH",
      "SKF NJG 2334 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2336-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2336 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1870,
    "static_load_kN": 2650,
    "fatigue_load_limit_kN": 255,
    "max_rpm": 800,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 800,
    "weight_g": 69500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NJG 2336 VH is a single-row full-complement cylindrical roller bearing sized 180×380×126 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 100.0 mm and the catalogue mass 69500 g; at 1870 kN dynamic rating this is roughly 10.39 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 126 mm-wide ring and concentrates load.",
      "The 1870/2650 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2336-VH?",
        "a": "SKF NJG 2336 VH is a single-row full-complement cylindrical roller bearing with 180 mm bore, 380 mm OD and 126 mm width per ISO 15. SKF lists C 1870 kN, C0 2650 kN, Pu 255 kN, reference speed 670 r/min and limiting speed 800 r/min, mass about 69500 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2336-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2336-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2336-VH",
      "SKF NJG 2336 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2338-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2338 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2160,
    "static_load_kN": 3000,
    "fatigue_load_limit_kN": 280,
    "max_rpm": 800,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 800,
    "weight_g": 80000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJG 2338 VH resolves to a 190×400×132 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 105.0 mm and the catalogue mass 80000 g; at 2160 kN dynamic rating this is roughly 11.37 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 2160/3000 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2338-VH?",
        "a": "SKF NJG 2338 VH is a single-row full-complement cylindrical roller bearing with 190 mm bore, 400 mm OD and 132 mm width per ISO 15. SKF lists C 2160 kN, C0 3000 kN, Pu 280 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 80000 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2338-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2338-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2338-VH",
      "SKF NJG 2338 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2340-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2340 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2290,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 290,
    "max_rpm": 750,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 750,
    "weight_g": 92000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 200 mm shaft, SKF lists NJG2340-VH as single-row full-complement cylindrical roller: 420 mm OD, 138 mm wide, Pu 290 kN, the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 200 mm seat is about 11.45 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 3200 kN for static checks such as crane hook blocks standing under load. Fit practice for NJG2340-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 750 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "The 2290/3200 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2340-VH?",
        "a": "SKF NJG 2340 VH is a single-row full-complement cylindrical roller bearing with 200 mm bore, 420 mm OD and 138 mm width per ISO 15. SKF lists C 2290 kN, C0 3200 kN, Pu 290 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 92000 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2340-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2340-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2340-VH",
      "SKF NJG 2340 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2344-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2344 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2700,
    "static_load_kN": 3750,
    "fatigue_load_limit_kN": 335,
    "max_rpm": 670,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 670,
    "weight_g": 111000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJG2344-VH is the 220 mm bore entry in the NJG2300 range: a 220×460×145 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2700 kN / C0 3750 kN. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 2700 kN and C0 3750 kN, size the bearing on the 220×460 mm ISO 15 envelope and check the 335 kN Pu against the equivalent-load floor; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 670 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 145 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.",
      "The 2700/3750 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2344-VH?",
        "a": "SKF NJG 2344 VH is a single-row full-complement cylindrical roller bearing with 220 mm bore, 460 mm OD and 145 mm width per ISO 15. SKF lists C 2700 kN, C0 3750 kN, Pu 335 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 111000 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2344-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2344-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2344-VH",
      "SKF NJG 2344 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2348-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2348 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3140,
    "static_load_kN": 4400,
    "fatigue_load_limit_kN": 390,
    "max_rpm": 600,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 600,
    "weight_g": 147000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJG 2348 VH resolves to a 240×500×155 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 3140 kN and C0 4400 kN, size the bearing on the 240×500 mm ISO 15 envelope and check the 390 kN Pu against the equivalent-load floor; the catalogue lists 480 r/min thermal reference speed and 600 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 240 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts",
      "heavy offshore winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 155 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 3140/4400 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2348-VH?",
        "a": "SKF NJG 2348 VH is a single-row full-complement cylindrical roller bearing with 240 mm bore, 500 mm OD and 155 mm width per ISO 15. SKF lists C 3140 kN, C0 4400 kN, Pu 390 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 147000 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2348-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2348-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2348-VH",
      "SKF NJG 2348 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG2352-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 2352 VH",
    "series": "NJG2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 3580,
    "static_load_kN": 5000,
    "fatigue_load_limit_kN": 430,
    "max_rpm": 530,
    "reference_speed_rpm": 430,
    "limiting_speed_rpm": 530,
    "weight_g": 177000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NJG 2352 VH resolves to a 260×540×165 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 260 mm seat is about 13.77 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 5000 kN for static checks such as crane hook blocks standing under load. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "heavy offshore winch drums",
      "large rolling-mill and continuous-caster drives",
      "mining crusher eccentric shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 530 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 3580/5000 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG2352-VH?",
        "a": "SKF NJG 2352 VH is a single-row full-complement cylindrical roller bearing with 260 mm bore, 540 mm OD and 165 mm width per ISO 15. SKF lists C 3580 kN, C0 5000 kN, Pu 430 kN, reference speed 430 r/min and limiting speed 530 r/min, mass about 177000 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG2352-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG2352-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG2352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG2352-VH",
      "SKF NJG 2352 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJG309-VH",
    "brand": "SKF",
    "manufacturer_designation": "SKF NJG 309 VH",
    "series": "NJG300-series",
    "type": "cylindrical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 110,
    "static_load_kN": 112,
    "fatigue_load_limit_kN": 14,
    "max_rpm": 9000,
    "reference_speed_rpm": 7500,
    "limiting_speed_rpm": 9000,
    "weight_g": 940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJG309-VH is the 45 mm bore entry in the NJG300 range: a 45×100×25 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 110 kN / C0 112 kN. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.02 (112 against 110 kN), and the Pu figure 14 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 7,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "crane travel-wheel bearings",
      "rolling-mill table rollers",
      "slew and swing drives",
      "heavy gearbox output shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "Full-complement bearings trade speed for capacity: the 9,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.",
      "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "The 110/112 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJG309-VH?",
        "a": "SKF NJG 309 VH is a single-row full-complement cylindrical roller bearing with 45 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 110 kN, C0 112 kN, Pu 14 kN, reference speed 7,500 r/min and limiting speed 9,000 r/min, mass about 940 g."
      },
      {
        "q": "What does the NJG designation and VH suffix mean?",
        "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling."
      },
      {
        "q": "Can NJG309-VH take axial load and locate the shaft?",
        "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution."
      },
      {
        "q": "How does NJG309-VH compare with the other executions in the same envelope?",
        "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJG309",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NJG309-VH",
      "SKF NJG 309 VH"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4830-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4830 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 190,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 255,
    "static_load_kN": 585,
    "fatigue_load_limit_kN": 60,
    "max_rpm": 1800,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1800,
    "weight_g": 2900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4830 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 150×190×40 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 2900 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 150 mm seat is about 1.70 kN/mm, typical of dimension series 48 (compact heavy section); use C0 585 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4830-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 255/585 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4830-CV?",
        "a": "SKF NNC 4830 CV is a double-row full-complement cylindrical roller bearing with 150 mm bore, 190 mm OD and 40 mm width per ISO 15. SKF lists C 255 kN, C0 585 kN, Pu 60 kN, reference speed 1,500 r/min and limiting speed 1,800 r/min, mass about 2900 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4830-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4830-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4830-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×190×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4830-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×190×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4830-CV",
      "SKF NNC 4830 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4832-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4832 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 200,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 260,
    "static_load_kN": 610,
    "fatigue_load_limit_kN": 62,
    "max_rpm": 1700,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1700,
    "weight_g": 3100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NNC 4832 CV resolves to a 160×200×40 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 160 mm seat is about 1.63 kN/mm, typical of dimension series 48 (compact heavy section); use C0 610 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.",
      "The 260/610 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4832-CV?",
        "a": "SKF NNC 4832 CV is a double-row full-complement cylindrical roller bearing with 160 mm bore, 200 mm OD and 40 mm width per ISO 15. SKF lists C 260 kN, C0 610 kN, Pu 62 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 3100 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4832-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4832-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4832-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×200×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4832-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×200×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4832-CV",
      "SKF NNC 4832 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4834-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4834 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 215,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 286,
    "static_load_kN": 655,
    "fatigue_load_limit_kN": 65.5,
    "max_rpm": 1600,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1600,
    "weight_g": 4000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 170 mm shaft, SKF lists NNC4834-CV as double-row full-complement cylindrical roller: 215 mm OD, 45 mm wide, Pu 65.5 kN, the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 170 mm seat is about 1.68 kN/mm, typical of dimension series 48 (compact heavy section); use C0 655 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.",
      "The 286/655 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4834-CV?",
        "a": "SKF NNC 4834 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 215 mm OD and 45 mm width per ISO 15. SKF lists C 286 kN, C0 655 kN, Pu 65.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 4000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4834-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4834-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4834-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×215×45 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4834-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×215×45 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4834-CV",
      "SKF NNC 4834 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4836-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4836 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 225,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 297,
    "static_load_kN": 695,
    "fatigue_load_limit_kN": 69.5,
    "max_rpm": 1500,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1500,
    "weight_g": 4300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4836 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 180×225×45 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 4300 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 180 mm seat is about 1.65 kN/mm, typical of dimension series 48 (compact heavy section); use C0 695 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 297/695 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4836-CV?",
        "a": "SKF NNC 4836 CV is a double-row full-complement cylindrical roller bearing with 180 mm bore, 225 mm OD and 45 mm width per ISO 15. SKF lists C 297 kN, C0 695 kN, Pu 69.5 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 4300 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4836-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4836-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4836-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×225×45 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4836-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×225×45 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4836-CV",
      "SKF NNC 4836 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4838-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4838 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 358,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 76.5,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 5650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNC4838-CV is the 190 mm bore entry in the NNC4800 range: a 190×240×50 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 358 kN / C0 750 kN. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4838-CV: the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. The mass entry 5650 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.",
      "The 358/750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4838-CV?",
        "a": "SKF NNC 4838 CV is a double-row full-complement cylindrical roller bearing with 190 mm bore, 240 mm OD and 50 mm width per ISO 15. SKF lists C 358 kN, C0 750 kN, Pu 76.5 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 5650 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4838-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4838-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4838-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×240×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4838-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×240×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4838-CV",
      "SKF NNC 4838 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4840-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4840 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 250,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 369,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 80,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 5900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4840 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 200×250×50 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 5900 g. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.17 (800 against 369 kN), and the Pu figure 80 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 369/800 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4840-CV?",
        "a": "SKF NNC 4840 CV is a double-row full-complement cylindrical roller bearing with 200 mm bore, 250 mm OD and 50 mm width per ISO 15. SKF lists C 369 kN, C0 800 kN, Pu 80 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 5900 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4840-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4840-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4840-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×250×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4840-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×250×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4840-CV",
      "SKF NNC 4840 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4844-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4844 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 270,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 380,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 85,
    "max_rpm": 1200,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1200,
    "weight_g": 6400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NNC 4844 CV is a double-row full-complement cylindrical roller bearing sized 220×270×50 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.28 (865 against 380 kN), and the Pu figure 85 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,000 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.",
      "The 380/865 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4844-CV?",
        "a": "SKF NNC 4844 CV is a double-row full-complement cylindrical roller bearing with 220 mm bore, 270 mm OD and 50 mm width per ISO 15. SKF lists C 380 kN, C0 865 kN, Pu 85 kN, reference speed 1,000 r/min and limiting speed 1,200 r/min, mass about 6400 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4844-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4844-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4844-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×270×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4844-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×270×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4844-CV",
      "SKF NNC 4844 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4848-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4848 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 300,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 539,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 125,
    "max_rpm": 1100,
    "reference_speed_rpm": 900,
    "limiting_speed_rpm": 1100,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 240 mm shaft, SKF lists NNC4848-CV as double-row full-complement cylindrical roller: 300 mm OD, 60 mm wide, Pu 125 kN, the catalogue lists 900 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 240 mm seat is about 2.25 kN/mm, typical of dimension series 48 (compact heavy section); use C0 1290 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4848-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.",
      "The 539/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4848-CV?",
        "a": "SKF NNC 4848 CV is a double-row full-complement cylindrical roller bearing with 240 mm bore, 300 mm OD and 60 mm width per ISO 15. SKF lists C 539 kN, C0 1290 kN, Pu 125 kN, reference speed 900 r/min and limiting speed 1,100 r/min, mass about 10000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4848-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4848-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4848-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 240×300×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4848-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 240×300×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4848-CV",
      "SKF NNC 4848 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4852-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4852 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 320,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 561,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 132,
    "max_rpm": 1000,
    "reference_speed_rpm": 800,
    "limiting_speed_rpm": 1000,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 260 mm shaft, SKF lists NNC4852-CV as double-row full-complement cylindrical roller: 320 mm OD, 60 mm wide, Pu 132 kN, the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 30.0 mm and the catalogue mass 11000 g; at 561 kN dynamic rating this is roughly 2.16 kN of C per millimetre of bore before application factors. Fit practice for NNC4852-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "The 561/1400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4852-CV?",
        "a": "SKF NNC 4852 CV is a double-row full-complement cylindrical roller bearing with 260 mm bore, 320 mm OD and 60 mm width per ISO 15. SKF lists C 561 kN, C0 1400 kN, Pu 132 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 11000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4852-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4852-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4852-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 260×320×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4852-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 260×320×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4852-CV",
      "SKF NNC 4852 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4856-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4856 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 350,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 737,
    "static_load_kN": 1860,
    "fatigue_load_limit_kN": 173,
    "max_rpm": 950,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 950,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNC4856-CV is the 280 mm bore entry in the NNC4800 range: a 280×350×69 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 737 kN / C0 1860 kN. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 35.0 mm and the catalogue mass 16000 g; at 737 kN dynamic rating this is roughly 2.63 kN of C per millimetre of bore before application factors. Fit practice for NNC4856-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 737/1860 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4856-CV?",
        "a": "SKF NNC 4856 CV is a double-row full-complement cylindrical roller bearing with 280 mm bore, 350 mm OD and 69 mm width per ISO 15. SKF lists C 737 kN, C0 1860 kN, Pu 173 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 16000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4856-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4856-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4856-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 280×350×69 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4856-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 280×350×69 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4856-CV",
      "SKF NNC 4856 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4860-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4860 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 380,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 858,
    "static_load_kN": 2120,
    "fatigue_load_limit_kN": 196,
    "max_rpm": 850,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 850,
    "weight_g": 23000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NNC 4860 CV resolves to a 300×380×80 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 858 kN and C0 2120 kN, size the bearing on the 300×380 mm ISO 15 envelope and check the 196 kN Pu against the equivalent-load floor; the catalogue lists 700 r/min thermal reference speed and 850 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 858/2120 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4860-CV?",
        "a": "SKF NNC 4860 CV is a double-row full-complement cylindrical roller bearing with 300 mm bore, 380 mm OD and 80 mm width per ISO 15. SKF lists C 858 kN, C0 2120 kN, Pu 196 kN, reference speed 700 r/min and limiting speed 850 r/min, mass about 23000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4860-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4860-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4860-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 300×380×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4860-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 300×380×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4860-CV",
      "SKF NNC 4860 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4864-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4864 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 400,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 897,
    "static_load_kN": 2280,
    "fatigue_load_limit_kN": 208,
    "max_rpm": 800,
    "reference_speed_rpm": 630,
    "limiting_speed_rpm": 800,
    "weight_g": 24000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4864 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 320×400×80 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 24000 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 897 kN and C0 2280 kN, size the bearing on the 320×400 mm ISO 15 envelope and check the 208 kN Pu against the equivalent-load floor; the catalogue lists 630 r/min thermal reference speed and 800 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "The 897/2280 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4864-CV?",
        "a": "SKF NNC 4864 CV is a double-row full-complement cylindrical roller bearing with 320 mm bore, 400 mm OD and 80 mm width per ISO 15. SKF lists C 897 kN, C0 2280 kN, Pu 208 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 24000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4864-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4864-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4864-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 320×400×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4864-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 320×400×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4864-CV",
      "SKF NNC 4864 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4868-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4868 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 913,
    "static_load_kN": 2400,
    "fatigue_load_limit_kN": 216,
    "max_rpm": 750,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 750,
    "weight_g": 25500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NNC 4868 CV is a double-row full-complement cylindrical roller bearing sized 340×420×80 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 40.0 mm and the catalogue mass 25500 g; at 913 kN dynamic rating this is roughly 2.69 kN of C per millimetre of bore before application factors. Fit practice for NNC4868-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "The 913/2400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4868-CV?",
        "a": "SKF NNC 4868 CV is a double-row full-complement cylindrical roller bearing with 340 mm bore, 420 mm OD and 80 mm width per ISO 15. SKF lists C 913 kN, C0 2400 kN, Pu 216 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 25500 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4868-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4868-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4868-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 340×420×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4868-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 340×420×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4868-CV",
      "SKF NNC 4868 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4872-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4872 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 440,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 935,
    "static_load_kN": 2550,
    "fatigue_load_limit_kN": 224,
    "max_rpm": 700,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 700,
    "weight_g": 27000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NNC 4872 CV is a double-row full-complement cylindrical roller bearing sized 360×440×80 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 360 mm seat is about 2.60 kN/mm, typical of dimension series 48 (compact heavy section); use C0 2550 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4872-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.",
      "The 935/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4872-CV?",
        "a": "SKF NNC 4872 CV is a double-row full-complement cylindrical roller bearing with 360 mm bore, 440 mm OD and 80 mm width per ISO 15. SKF lists C 935 kN, C0 2550 kN, Pu 224 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 27000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4872-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4872-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4872-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 360×440×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4872-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 360×440×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4872-CV",
      "SKF NNC 4872 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4876-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4876 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 480,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1400,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 315,
    "max_rpm": 670,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 670,
    "weight_g": 45500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 380 mm shaft, SKF lists NNC4876-CV as double-row full-complement cylindrical roller: 480 mm OD, 100 mm wide, Pu 315 kN, the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1400 kN and C0 3650 kN, size the bearing on the 380×480 mm ISO 15 envelope and check the 315 kN Pu against the equivalent-load floor; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 380 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.",
      "The 1400/3650 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4876-CV?",
        "a": "SKF NNC 4876 CV is a double-row full-complement cylindrical roller bearing with 380 mm bore, 480 mm OD and 100 mm width per ISO 15. SKF lists C 1400 kN, C0 3650 kN, Pu 315 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 45500 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4876-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4876-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4876-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 380×480×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4876-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 380×480×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4876-CV",
      "SKF NNC 4876 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4880-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4880 CV",
    "series": "NNC4800-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 500,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1420,
    "static_load_kN": 3750,
    "fatigue_load_limit_kN": 325,
    "max_rpm": 630,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 630,
    "weight_g": 46500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 400 mm shaft, SKF lists NNC4880-CV as double-row full-complement cylindrical roller: 500 mm OD, 100 mm wide, Pu 325 kN, the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.64 (3750 against 1420 kN), and the Pu figure 325 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1420/3750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4880-CV?",
        "a": "SKF NNC 4880 CV is a double-row full-complement cylindrical roller bearing with 400 mm bore, 500 mm OD and 100 mm width per ISO 15. SKF lists C 1420 kN, C0 3750 kN, Pu 325 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 46500 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4880-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4880-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4880-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 400×500×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4880-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 400×500×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4880-CV",
      "SKF NNC 4880 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4912-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4912 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 60,
    "D_mm": 85,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 78.1,
    "static_load_kN": 137,
    "fatigue_load_limit_kN": 14.3,
    "max_rpm": 4500,
    "reference_speed_rpm": 3600,
    "limiting_speed_rpm": 4500,
    "weight_g": 490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NNC 4912 CV is a double-row full-complement cylindrical roller bearing sized 60×85×25 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4912-CV: the catalogue lists 3,600 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 490 g covers the complete catalogue execution. Fit practice for NNC4912-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "offshore crane sheaves",
      "heavy material-handling rope pulleys",
      "rolling-mill and caster drives",
      "large crane and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 85 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.",
      "The 78.1/137 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4912-CV?",
        "a": "SKF NNC 4912 CV is a double-row full-complement cylindrical roller bearing with 60 mm bore, 85 mm OD and 25 mm width per ISO 15. SKF lists C 78.1 kN, C0 137 kN, Pu 14.3 kN, reference speed 3,600 r/min and limiting speed 4,500 r/min, mass about 490 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4912-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4912-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4912-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×85×25 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4912-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 60×85×25 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4912-CV",
      "SKF NNC 4912 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4914-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4914 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 70,
    "D_mm": 100,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 114,
    "static_load_kN": 193,
    "fatigue_load_limit_kN": 22.4,
    "max_rpm": 3800,
    "reference_speed_rpm": 3000,
    "limiting_speed_rpm": 3800,
    "weight_g": 780,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NNC 4914 CV resolves to a 70×100×30 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 114 kN and C0 193 kN, size the bearing on the 70×100 mm ISO 15 envelope and check the 22.4 kN Pu against the equivalent-load floor; the catalogue lists 3,000 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "rolling-mill and caster drives",
      "large crane and winch drums",
      "offshore crane sheaves",
      "heavy material-handling rope pulleys"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.",
      "The 114/193 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4914-CV?",
        "a": "SKF NNC 4914 CV is a double-row full-complement cylindrical roller bearing with 70 mm bore, 100 mm OD and 30 mm width per ISO 15. SKF lists C 114 kN, C0 193 kN, Pu 22.4 kN, reference speed 3,000 r/min and limiting speed 3,800 r/min, mass about 780 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4914-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4914-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4914-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×100×30 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4914-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 70×100×30 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4914-CV",
      "SKF NNC 4914 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4916-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4916 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 80,
    "D_mm": 110,
    "B_mm": 30,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 121,
    "static_load_kN": 216,
    "fatigue_load_limit_kN": 25,
    "max_rpm": 3400,
    "reference_speed_rpm": 2600,
    "limiting_speed_rpm": 3400,
    "weight_g": 880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 80 mm shaft, SKF lists NNC4916-CV as double-row full-complement cylindrical roller: 110 mm OD, 30 mm wide, Pu 25 kN, the catalogue lists 2,600 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 121 kN and C0 216 kN, size the bearing on the 80×110 mm ISO 15 envelope and check the 25 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "heavy material-handling rope pulleys",
      "rolling-mill and caster drives",
      "large crane and winch drums",
      "offshore crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.",
      "The 121/216 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4916-CV?",
        "a": "SKF NNC 4916 CV is a double-row full-complement cylindrical roller bearing with 80 mm bore, 110 mm OD and 30 mm width per ISO 15. SKF lists C 121 kN, C0 216 kN, Pu 25 kN, reference speed 2,600 r/min and limiting speed 3,400 r/min, mass about 880 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4916-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4916-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4916-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×110×30 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4916-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 80×110×30 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4916-CV",
      "SKF NNC 4916 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4918-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4918 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 90,
    "D_mm": 125,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 161,
    "static_load_kN": 300,
    "fatigue_load_limit_kN": 35.5,
    "max_rpm": 3000,
    "reference_speed_rpm": 2400,
    "limiting_speed_rpm": 3000,
    "weight_g": 1350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4918 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 90×125×35 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 1350 g. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 161 kN and C0 300 kN, size the bearing on the 90×125 mm ISO 15 envelope and check the 35.5 kN Pu against the equivalent-load floor; the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "offshore crane sheaves",
      "heavy material-handling rope pulleys",
      "rolling-mill and caster drives",
      "large crane and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 161/300 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4918-CV?",
        "a": "SKF NNC 4918 CV is a double-row full-complement cylindrical roller bearing with 90 mm bore, 125 mm OD and 35 mm width per ISO 15. SKF lists C 161 kN, C0 300 kN, Pu 35.5 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 1350 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4918-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4918-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4918-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×125×35 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4918-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 90×125×35 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4918-CV",
      "SKF NNC 4918 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4920-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4920 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 100,
    "D_mm": 140,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 209,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 46.5,
    "max_rpm": 2600,
    "reference_speed_rpm": 2000,
    "limiting_speed_rpm": 2600,
    "weight_g": 1950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 100 mm shaft, SKF lists NNC4920-CV as double-row full-complement cylindrical roller: 140 mm OD, 40 mm wide, Pu 46.5 kN, the catalogue lists 2,000 r/min thermal reference speed and 2,600 r/min mechanical limiting speed. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 100 mm seat is about 2.09 kN/mm, typical of dimension series 49 (compact heavy section); use C0 400 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "offshore crane sheaves",
      "heavy material-handling rope pulleys",
      "rolling-mill and caster drives",
      "large crane and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.",
      "The 209/400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4920-CV?",
        "a": "SKF NNC 4920 CV is a double-row full-complement cylindrical roller bearing with 100 mm bore, 140 mm OD and 40 mm width per ISO 15. SKF lists C 209 kN, C0 400 kN, Pu 46.5 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 1950 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4920-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4920-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4920-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×140×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4920-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 100×140×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4920-CV",
      "SKF NNC 4920 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4922-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4922 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 110,
    "D_mm": 150,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 220,
    "static_load_kN": 430,
    "fatigue_load_limit_kN": 49,
    "max_rpm": 2400,
    "reference_speed_rpm": 1900,
    "limiting_speed_rpm": 2400,
    "weight_g": 2150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4922 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 110×150×40 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 2150 g. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4922-CV: the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. The mass entry 2150 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "rolling-mill and caster drives",
      "large crane and winch drums",
      "offshore crane sheaves",
      "heavy material-handling rope pulleys"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 220/430 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4922-CV?",
        "a": "SKF NNC 4922 CV is a double-row full-complement cylindrical roller bearing with 110 mm bore, 150 mm OD and 40 mm width per ISO 15. SKF lists C 220 kN, C0 430 kN, Pu 49 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 2150 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4922-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4922-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4922-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×150×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4922-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 110×150×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4922-CV",
      "SKF NNC 4922 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4924-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4924 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 120,
    "D_mm": 165,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 242,
    "static_load_kN": 480,
    "fatigue_load_limit_kN": 53,
    "max_rpm": 2200,
    "reference_speed_rpm": 1700,
    "limiting_speed_rpm": 2200,
    "weight_g": 2950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNC4924-CV is the 120 mm bore entry in the NNC4900 range: a 120×165×45 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 242 kN / C0 480 kN. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNC4924-CV: the catalogue lists 1,700 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. The mass entry 2950 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 165 mm raceway.",
      "The 242/480 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4924-CV?",
        "a": "SKF NNC 4924 CV is a double-row full-complement cylindrical roller bearing with 120 mm bore, 165 mm OD and 45 mm width per ISO 15. SKF lists C 242 kN, C0 480 kN, Pu 53 kN, reference speed 1,700 r/min and limiting speed 2,200 r/min, mass about 2950 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4924-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4924-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4924-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×165×45 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4924-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 120×165×45 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4924-CV",
      "SKF NNC 4924 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4926-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4926 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 130,
    "D_mm": 180,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 297,
    "static_load_kN": 530,
    "fatigue_load_limit_kN": 60,
    "max_rpm": 2000,
    "reference_speed_rpm": 1600,
    "limiting_speed_rpm": 2000,
    "weight_g": 3950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NNC 4926 CV is a double-row full-complement cylindrical roller bearing sized 130×180×50 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4926-CV: the catalogue lists 1,600 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The mass entry 3950 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.",
      "The 297/530 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4926-CV?",
        "a": "SKF NNC 4926 CV is a double-row full-complement cylindrical roller bearing with 130 mm bore, 180 mm OD and 50 mm width per ISO 15. SKF lists C 297 kN, C0 530 kN, Pu 60 kN, reference speed 1,600 r/min and limiting speed 2,000 r/min, mass about 3950 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4926-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4926-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4926-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×180×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4926-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 130×180×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4926-CV",
      "SKF NNC 4926 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4928-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4928 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 140,
    "D_mm": 190,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 308,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 63,
    "max_rpm": 1900,
    "reference_speed_rpm": 1500,
    "limiting_speed_rpm": 1900,
    "weight_g": 4200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4928 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 140×190×50 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 4200 g. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNC4928-CV: the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. The mass entry 4200 g covers the complete catalogue execution. Fit practice for NNC4928-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 308/570 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4928-CV?",
        "a": "SKF NNC 4928 CV is a double-row full-complement cylindrical roller bearing with 140 mm bore, 190 mm OD and 50 mm width per ISO 15. SKF lists C 308 kN, C0 570 kN, Pu 63 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 4200 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4928-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4928-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4928-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×190×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4928-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 140×190×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4928-CV",
      "SKF NNC 4928 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4930-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4930 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 150,
    "D_mm": 210,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 429,
    "static_load_kN": 830,
    "fatigue_load_limit_kN": 91.5,
    "max_rpm": 1700,
    "reference_speed_rpm": 1400,
    "limiting_speed_rpm": 1700,
    "weight_g": 6650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 150 mm shaft, SKF lists NNC4930-CV as double-row full-complement cylindrical roller: 210 mm OD, 60 mm wide, Pu 91.5 kN, the catalogue lists 1,400 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 30.0 mm and the catalogue mass 6650 g; at 429 kN dynamic rating this is roughly 2.86 kN of C per millimetre of bore before application factors. Fit practice for NNC4930-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.",
      "The 429/830 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4930-CV?",
        "a": "SKF NNC 4930 CV is a double-row full-complement cylindrical roller bearing with 150 mm bore, 210 mm OD and 60 mm width per ISO 15. SKF lists C 429 kN, C0 830 kN, Pu 91.5 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 6650 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4930-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4930-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4930-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×210×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4930-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 150×210×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4930-CV",
      "SKF NNC 4930 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4932-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4932 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 446,
    "static_load_kN": 915,
    "fatigue_load_limit_kN": 96.5,
    "max_rpm": 1600,
    "reference_speed_rpm": 1300,
    "limiting_speed_rpm": 1600,
    "weight_g": 7000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4932 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 160×220×60 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 7000 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 160 mm seat is about 2.79 kN/mm, typical of dimension series 49 (compact heavy section); use C0 915 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 446/915 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4932-CV?",
        "a": "SKF NNC 4932 CV is a double-row full-complement cylindrical roller bearing with 160 mm bore, 220 mm OD and 60 mm width per ISO 15. SKF lists C 446 kN, C0 915 kN, Pu 96.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 7000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4932-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4932-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4932-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×220×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4932-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 160×220×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4932-CV",
      "SKF NNC 4932 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4934-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4934 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 457,
    "static_load_kN": 950,
    "fatigue_load_limit_kN": 100,
    "max_rpm": 1500,
    "reference_speed_rpm": 1200,
    "limiting_speed_rpm": 1500,
    "weight_g": 7350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNC4934-CV is the 170 mm bore entry in the NNC4900 range: a 170×230×60 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 457 kN / C0 950 kN. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 170 mm seat is about 2.69 kN/mm, typical of dimension series 49 (compact heavy section); use C0 950 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.",
      "The 457/950 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4934-CV?",
        "a": "SKF NNC 4934 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 230 mm OD and 60 mm width per ISO 15. SKF lists C 457 kN, C0 950 kN, Pu 100 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 7350 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4934-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4934-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4934-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4934-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4934-CV",
      "SKF NNC 4934 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4936-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4936 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 594,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 127,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NNC 4936 CV is a double-row full-complement cylindrical roller bearing sized 180×250×69 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 180 mm seat is about 3.30 kN/mm, typical of dimension series 49 (compact heavy section); use C0 1220 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.",
      "The 594/1220 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4936-CV?",
        "a": "SKF NNC 4936 CV is a double-row full-complement cylindrical roller bearing with 180 mm bore, 250 mm OD and 69 mm width per ISO 15. SKF lists C 594 kN, C0 1220 kN, Pu 127 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 11000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4936-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4936-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4936-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×250×69 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4936-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 180×250×69 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4936-CV",
      "SKF NNC 4936 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4938-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4938 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 605,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 132,
    "max_rpm": 1400,
    "reference_speed_rpm": 1100,
    "limiting_speed_rpm": 1400,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NNC 4938 CV resolves to a 190×260×69 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 190 mm seat is about 3.18 kN/mm, typical of dimension series 49 (compact heavy section); use C0 1290 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 605/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4938-CV?",
        "a": "SKF NNC 4938 CV is a double-row full-complement cylindrical roller bearing with 190 mm bore, 260 mm OD and 69 mm width per ISO 15. SKF lists C 605 kN, C0 1290 kN, Pu 132 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 11000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4938-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4938-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4938-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×260×69 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4938-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 190×260×69 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4938-CV",
      "SKF NNC 4938 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4940-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4940 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 704,
    "static_load_kN": 1500,
    "fatigue_load_limit_kN": 153,
    "max_rpm": 1300,
    "reference_speed_rpm": 1000,
    "limiting_speed_rpm": 1300,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NNC 4940 CV is a double-row full-complement cylindrical roller bearing sized 200×280×80 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 704 kN and C0 1500 kN, size the bearing on the 200×280 mm ISO 15 envelope and check the 153 kN Pu against the equivalent-load floor; the catalogue lists 1,000 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "hard-particle indentation of the raceway in unfiltered oil systems"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.",
      "The 704/1500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4940-CV?",
        "a": "SKF NNC 4940 CV is a double-row full-complement cylindrical roller bearing with 200 mm bore, 280 mm OD and 80 mm width per ISO 15. SKF lists C 704 kN, C0 1500 kN, Pu 153 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 16000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4940-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4940-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4940-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×280×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4940-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 200×280×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4940-CV",
      "SKF NNC 4940 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4944-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4944 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 737,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 160,
    "max_rpm": 1200,
    "reference_speed_rpm": 950,
    "limiting_speed_rpm": 1200,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 220 mm shaft, SKF lists NNC4944-CV as double-row full-complement cylindrical roller: 300 mm OD, 80 mm wide, Pu 160 kN, the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.17 (1600 against 737 kN), and the Pu figure 160 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.",
      "The 737/1600 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4944-CV?",
        "a": "SKF NNC 4944 CV is a double-row full-complement cylindrical roller bearing with 220 mm bore, 300 mm OD and 80 mm width per ISO 15. SKF lists C 737 kN, C0 1600 kN, Pu 160 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 17000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4944-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4944-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4944-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×300×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4944-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 220×300×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4944-CV",
      "SKF NNC 4944 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4948-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4948 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 781,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 173,
    "max_rpm": 1100,
    "reference_speed_rpm": 850,
    "limiting_speed_rpm": 1100,
    "weight_g": 18500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNC4948-CV is the 240 mm bore entry in the NNC4900 range: a 240×320×80 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 781 kN / C0 1760 kN. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.25 (1760 against 781 kN), and the Pu figure 173 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 781/1760 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4948-CV?",
        "a": "SKF NNC 4948 CV is a double-row full-complement cylindrical roller bearing with 240 mm bore, 320 mm OD and 80 mm width per ISO 15. SKF lists C 781 kN, C0 1760 kN, Pu 173 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 18500 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4948-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4948-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4948-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 240×320×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4948-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 240×320×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4948-CV",
      "SKF NNC 4948 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4952-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4952 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1170,
    "static_load_kN": 2550,
    "fatigue_load_limit_kN": 245,
    "max_rpm": 950,
    "reference_speed_rpm": 750,
    "limiting_speed_rpm": 950,
    "weight_g": 32000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NNC 4952 CV resolves to a 260×360×100 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 1170 kN and C0 2550 kN, size the bearing on the 260×360 mm ISO 15 envelope and check the 245 kN Pu against the equivalent-load floor; the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 260 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "rolling-contact fatigue spalling after the rated L10 life is exceeded"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1170/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4952-CV?",
        "a": "SKF NNC 4952 CV is a double-row full-complement cylindrical roller bearing with 260 mm bore, 360 mm OD and 100 mm width per ISO 15. SKF lists C 1170 kN, C0 2550 kN, Pu 245 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 32000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4952-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4952-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4952-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 260×360×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4952-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 260×360×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4952-CV",
      "SKF NNC 4952 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4956-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4956 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1210,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 255,
    "max_rpm": 900,
    "reference_speed_rpm": 700,
    "limiting_speed_rpm": 900,
    "weight_g": 34000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4956 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 280×380×100 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 34000 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 1210 kN and C0 2700 kN, size the bearing on the 280×380 mm ISO 15 envelope and check the 255 kN Pu against the equivalent-load floor; the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 280 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 100 mm-wide ring and concentrates load.",
      "The 1210/2700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4956-CV?",
        "a": "SKF NNC 4956 CV is a double-row full-complement cylindrical roller bearing with 280 mm bore, 380 mm OD and 100 mm width per ISO 15. SKF lists C 1210 kN, C0 2700 kN, Pu 255 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 34000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4956-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4956-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4956-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 280×380×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4956-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 280×380×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4956-CV",
      "SKF NNC 4956 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4960-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4960 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1680,
    "static_load_kN": 3750,
    "fatigue_load_limit_kN": 355,
    "max_rpm": 800,
    "reference_speed_rpm": 670,
    "limiting_speed_rpm": 800,
    "weight_g": 53000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4960 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 300×420×118 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 53000 g. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 300 mm seat is about 5.60 kN/mm, typical of dimension series 49 (compact heavy section); use C0 3750 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 300 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.",
      "The 1680/3750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4960-CV?",
        "a": "SKF NNC 4960 CV is a double-row full-complement cylindrical roller bearing with 300 mm bore, 420 mm OD and 118 mm width per ISO 15. SKF lists C 1680 kN, C0 3750 kN, Pu 355 kN, reference speed 670 r/min and limiting speed 800 r/min, mass about 53000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4960-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4960-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4960-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 300×420×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4960-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 300×420×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4960-CV",
      "SKF NNC 4960 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4964-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4964 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1760,
    "static_load_kN": 4050,
    "fatigue_load_limit_kN": 375,
    "max_rpm": 750,
    "reference_speed_rpm": 600,
    "limiting_speed_rpm": 750,
    "weight_g": 56000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "SKF NNC 4964 CV is a double-row full-complement cylindrical roller bearing sized 320×440×118 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNC4964-CV: the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. The mass entry 56000 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.",
      "The 1760/4050 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4964-CV?",
        "a": "SKF NNC 4964 CV is a double-row full-complement cylindrical roller bearing with 320 mm bore, 440 mm OD and 118 mm width per ISO 15. SKF lists C 1760 kN, C0 4050 kN, Pu 375 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 56000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4964-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4964-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4964-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 320×440×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4964-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 320×440×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4964-CV",
      "SKF NNC 4964 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4968-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4968 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1790,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 390,
    "max_rpm": 700,
    "reference_speed_rpm": 560,
    "limiting_speed_rpm": 700,
    "weight_g": 59000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 340 mm shaft, SKF lists NNC4968-CV as double-row full-complement cylindrical roller: 460 mm OD, 118 mm wide, Pu 390 kN, the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4968-CV: the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. The mass entry 59000 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.",
    "applications": [
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "brinelling from static overload or impact during handling and mounting"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1790/4250 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4968-CV?",
        "a": "SKF NNC 4968 CV is a double-row full-complement cylindrical roller bearing with 340 mm bore, 460 mm OD and 118 mm width per ISO 15. SKF lists C 1790 kN, C0 4250 kN, Pu 390 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 59000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4968-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4968-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4968-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 340×460×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4968-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 340×460×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4968-CV",
      "SKF NNC 4968 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4972-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4972 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 1830,
    "static_load_kN": 4500,
    "fatigue_load_limit_kN": 405,
    "max_rpm": 670,
    "reference_speed_rpm": 530,
    "limiting_speed_rpm": 670,
    "weight_g": 62000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For a 360 mm shaft, SKF lists NNC4972-CV as double-row full-complement cylindrical roller: 480 mm OD, 118 mm wide, Pu 405 kN, the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 360 mm seat is about 5.08 kN/mm, typical of dimension series 49 (compact heavy section); use C0 4500 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4972-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "electrical pitting on VFD-driven shafts without grounding protection"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "The 1830/4500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4972-CV?",
        "a": "SKF NNC 4972 CV is a double-row full-complement cylindrical roller bearing with 360 mm bore, 480 mm OD and 118 mm width per ISO 15. SKF lists C 1830 kN, C0 4500 kN, Pu 405 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 62000 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4972-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4972-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4972-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 360×480×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4972-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 360×480×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4972-CV",
      "SKF NNC 4972 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4976-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4976 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2380,
    "static_load_kN": 5700,
    "fatigue_load_limit_kN": 500,
    "max_rpm": 630,
    "reference_speed_rpm": 500,
    "limiting_speed_rpm": 630,
    "weight_g": 92500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNC4976-CV is the 380 mm bore entry in the NNC4900 range: a 380×520×140 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2380 kN / C0 5700 kN. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 380 mm seat is about 6.26 kN/mm, typical of dimension series 49 (compact heavy section); use C0 5700 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4976-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.",
    "applications": [
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots",
      "steelmaking and heavy crane sheaves"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 140 mm-wide ring and concentrates load.",
      "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 140 mm-wide ring and concentrates load.",
      "The 2380/5700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4976-CV?",
        "a": "SKF NNC 4976 CV is a double-row full-complement cylindrical roller bearing with 380 mm bore, 520 mm OD and 140 mm width per ISO 15. SKF lists C 2380 kN, C0 5700 kN, Pu 500 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 92500 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4976-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4976-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4976-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 380×520×140 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4976-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 380×520×140 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4976-CV",
      "SKF NNC 4976 CV"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNC4980-CV",
    "brand": "SKF",
    "manufacturer_designation": "SKF NNC 4980 CV",
    "series": "NNC4900-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "none",
    "dynamic_load_kN": 2420,
    "static_load_kN": 6000,
    "fatigue_load_limit_kN": 520,
    "max_rpm": 600,
    "reference_speed_rpm": 480,
    "limiting_speed_rpm": 600,
    "weight_g": 96500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "Ordering number SKF NNC 4980 CV resolves to a 400×540×140 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 70.0 mm and the catalogue mass 96500 g; at 2420 kN dynamic rating this is roughly 6.05 kN of C per millimetre of bore before application factors. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.",
    "applications": [
      "steelmaking and heavy crane sheaves",
      "large offshore winch and hook blocks",
      "mining shovel and dragline pivots"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone",
      "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating",
      "roller smearing between the uncaged rollers during slow skidding starts under heavy static load",
      "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant",
      "roller-end scoring from inadequate oil flow in the roller-raceway contact",
      "uneven row loading from misalignment, concentrating fatigue on one row of the double complement",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.",
      "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.",
      "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.",
      "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.",
      "The 2420/6000 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNC4980-CV?",
        "a": "SKF NNC 4980 CV is a double-row full-complement cylindrical roller bearing with 400 mm bore, 540 mm OD and 140 mm width per ISO 15. SKF lists C 2420 kN, C0 6000 kN, Pu 520 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 96500 g."
      },
      {
        "q": "What does the NNC designation and CV suffix mean?",
        "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides."
      },
      {
        "q": "Can NNC4980-CV take axial load and locate the shaft?",
        "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float."
      },
      {
        "q": "How does NNC4980-CV compare with the other executions in the same envelope?",
        "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement."
      },
      {
        "q": "What limits the service life of this bearing most often?",
        "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNCF4980-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 400×540×140 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      },
      {
        "equiv_sku": "NNCL4980-CV",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Same ISO 15 envelope 400×540×140 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical."
      }
    ],
    "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings",
    "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings",
    "extracted_at": "2026-09-26",
    "last_verified": "2026-09-26",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "NNC4980-CV",
      "SKF NNC 4980 CV"
    ],
    "locale_variants": {}
  }
]